Game theory models for communication between agents: a review
 Aisha D. Farooqui^{1} and
 Muaz A. Niazi^{2}Email author
DOI: 10.1186/s4029401600267
© The Author(s) 2016
Received: 22 December 2015
Accepted: 6 July 2016
Published: 16 July 2016
Abstract
In the real world, agents or entities are in a continuous state of interactions. These interactions lead to various types of complexity dynamics. One key difficulty in the study of complex agent interactions is the difficulty of modeling agent communication on the basis of rewards. Game theory offers a perspective of analysis and modeling these interactions. Previously, while a large amount of literature is available on game theory, most of it is from specific domains and does not cater for the concepts from an agentbased perspective. Here in this paper, we present a comprehensive multidisciplinary stateoftheart review and taxonomy of game theory models of complex interactions between agents.
Keywords
Game theory applications Agentbased approach Complex adaptive systems Complex systems modeling Complex networks EconomicsBackground
In the real world, agents or entities are in a continuous state of interactions (Niazi et al. 2011). Examples of these include the continuously interacting agents in the stock market (Bonabeau 2002). These agents and systems can be adaptive in nature and can also evolve. Their current behavior can depend on the past so they often learn from history.
The interaction of agents leads to a wide variety of complexity dynamics (McDaniel and Driebe 2001). Complexity arises due to nonlinear agent interactions. The behavior of such nonlinear systems can be chaotic and unpredictable. Complex adaptive systems (CAS) in the natural world (Niazi et al. 2011) and complex physical systems (CPS) (Winsberg 2001) in manmade systems are examples of such agent interactions.
One key difficulty faced by Complexity researchers is in the modeling of communication and complex agent interaction (Niazi and Hussain 2012). Modern communication systems are often composed of hierarchical complex systems. These systems can be modeled as multiagent systems using agentbased modeling (ABM). Modeling CAS and CPS using ABM not only allows for prediction of outcomes but also helps in terms of gaining an understanding of the complex interconnnections and interactions (Epstein 2008). However, a key issue in such models is to understand the dynamics of agent interaction. Game Theory offers techniques and tools for modeling communication problems among agents.
Game theory offers a perspective of analysis and modeling of these interactions (Carmichael 2005). It is a discipline that studies decision making of interactive entities (Dixit and Skeath 1999). We can say that strategic thinking is perhaps the most recognized essence of game theory.
Previously, while a large amount of literature is available on game theory, most of it is focused on specific domains like Biology, Economics, and Computer Science (Shoham and LeytonBrown 2008). Game theory has also been used in business to model interactions of stakeholders etc.
To the best of our knowledge, there is an absence of a stateoftheart reviews of game theoretical literature from the agentbased modeling perspective. This paper presents a comprehensive review of game theory models and their applications. Additionally, a taxonomy of classes of games is also presented.
The paper is organized as follows: first, we give an overview of game theory and present a taxonomy of games. This is followed by literature review in the next section. Then, in the discussion we classify games and discuss open problems before concluding the paper.
Game theory overview
While the essence of game theory has perhaps practically applied itself since life presented itself on this planet, formal literature on the topic can be traced back to the work of Von Neumann and Morgenstern (1944). They worked on zerosum games. Then in the 1950s, Nash’s work resulted in significant advancement of this field (Nash 1950). Subsequently, Game theory has since been used in many different fields like biology (Hofbauer and Sigmund 1998), politics and other domains (Morrow 1994).
Game theory presents a technical analysis of strategic interactions (Shoham and LeytonBrown 2008). These strategic interactions are concerned with the interaction of decision makers in the game (Geckil and Anderson 2009). The behavior of a decision maker in game theory models is called “strategic” and the action performed while making any move is called a “strategy”. Strategy considers how agents act, what they prefer, how they make their decisions, and their behaviors etc. These interactions can be complex as the action of even a single agent can influence other agents and vice versa. Game theory can thus be considered as a powerful tool to model and understand complex interactions.
One way of classifying game theory models is to divide them into cooperative and noncooperative games (Shoham and LeytonBrown 2008). In cooperative games, we focus on a set of agents. Whereas, in noncooperative games the focus is on the development of models of interactions, preferences, and so on, with a focus on individual agents.^{1} It can model different types of games including zerosum (Shoham and LeytonBrown 2008), stochastic (Mertens and Neyman 1981), repeated Aumann and Maschler (game of fairness as if player cuts unequ), Bayesian (Böge and Eisele 1979) and congestion (Rosenthal 1973).
Multidisciplinary nature of game theory
Game theory can be seen everywhere in living systems, in general, and human society, in particular. In personal life as well as in professional life, every day we are faced with decisions which often can be simplified using game theory. There are different areas where game theory has been applied such as Economics, Politics etc.
(Shoham and LeytonBrown 2008). Algorithmic game theory is an example of application in computer science (Roughgarden 2010). Biologists have used it to learn species behaviors (Hofbauer and Sigmund 1998). In mathematics, there is a complete branch that studies decisionmaking process (Mazalov 2014). It also has its influences in business (Geckil and Anderson 2009). It can model interactions of stakeholders, dynamics in interest rates etc.
Dixit and Skeath (1999) note that we can use game theory mainly in three ways that are an explanation, prediction, and prescription.
Explanation
Game theory can be used to explain insights of a situation like why that happened, what were the causes, Effects of that happening etc. We can do a complete case study by using game theory.
Prediction
Game theory studies decision makers (autonomous agents) that have actions to take, preferences that what they want, different options which they can choose etc. By analyzing these actions, preferences, options etc we can predict different moves of agents on different types of situation.
Prescription
If we can analyze agent actions, strategies etc to predict its moves, then we can definitely give advice about different moves to agents. It means we can provide a sophisticated model for future decisionmakings.
Now let us consider basic concepts of game theory.
Basic concepts
Dixit and Nalebuff (1993) have defined Game theory as:
Definition 1
The branch of social science that studies strategic decisionmaking.
Another definition is by Hutton (1996):
Definition 2
An intellectual framework for examining what various parties to a decision should do given their possession of inadequate information and different objectives.
Shoham and LeytonBrown (2008) have defined game theory as:
Definition 3
Game theory is the mathematical study of interaction among independent, selfinterested agents.
In the oxford dictionary, selfinterested means selfseeking or selfserving. Anyone who is selfinterested is concerned strongly with own interests. This seems selfishness of someone who do not consider others interests.
However, in game theory, these are actually intelligent agents and their behavior is based on artificial intelligence models (Wooldridge 2009). These are autonomous entities, with their own description of world states and they behave accordingly (Shoham and LeytonBrown 2008). Unfortunately, there is no universal definition of the agent but autonomy is one of the basic properties of the agent.
In Computer Science, Algorithmic game theory is used (Roughgarden 2010). It combines game theory together with computer science. It focuses on creating algorithms for strategic interactions, calculating Nash equilibrium etc.
Game
Carmichael (2005) has defined games as:
Definition 4
A scenario or situation where for two or more individuals, their choice of action or behavior has an impact on the other (or others).

players

strategies (actions taken while interactions)

payoffs (utilities gained)

payoff function (calculates utility against each strategy)

and of course, game rules.
Definition 5
A gametheoretic model is an environment where each decision maker’s actions interact with those of others
Game representation
There are mainly two ways to represent the game. Normalform is simply a matrix that describes strategies and payoffs of the games (Morrow 1994). Another representation is extensiveform, which is a treelike structure (Morrow 1994). Extensiveform contains more information than normalform like a sequence of player moves. However, there are games that require richer representation such as infinite repeated games. To represent such games we have Beyond NormalExtensive form (Shoham and LeytonBrown 2008).
Decision theorem
Game theory has two decision theorems known as maximin and minimax (Mazalov 2014). The minimax theorem minimizes the loss of a player. The maximin theorem used to maximize the benefit gain by the player.
Games taxonomy
We saw different types of games in the literature review. These games were presented using three types of game representations. Normalform, extensiveform and beyond normal and extensiveform games (Shoham and LeytonBrown 2008). We proposed a taxonomy of games based on these three game representation types. See Fig. 1.
The taxonomy mainly classifies games into three types, as there are three types of representations. Then it further classifies games that are included in both normalform games and extensiveform games. Games included in both because a normalform representation can be derived from extensiveform games. Beyond normal and extensive form includes those games that need richer representation. These games can be infinite and undetermined. Therefore, that it is difficult to represent them in first two representations.
Normalform games

Set of players

Strategy space, a set of all strategies of a player

Payoff function, it calculates the utility against each strategy.
P1  P2  

H  T  
H  (1, −1)  (−1, 1) 
T  (−1, 1)  (1, −1) 
Extensiveform games
Beyond normal/extensive games

Repeated games: These are also called stage games. Players play these games multiple times (Aumann and Maschler 1995).

Stochastic games: These are also called Markov games. There are stages in the game. Every stage represents the state of a game from a finite set of game states. The player has a set of actions that consists of many finite actions (Mertens and Neyman 1981).

Bayesian games: These are games of incomplete information. Players select their strategies according to Bayes’ Rule (Böge and Eisele 1979).

Congestion games: These games are the class of nonconflicting games (Rosenthal 1973). In these games, all the players have same strategy set. The result of every player relies upon the strategy it picks and all other players picking the same strategy.
Complex adaptive systems
Complex systems have special types of systems known as Complex adaptive systems (Mitchell 2009). These systems have the dynamic environment and nonlinear interaction of components. The amazing thing for researchers is that these systems are composed of so simple components and exhibits emergent behavior when combined together. Such systems can be understood only by considering all components collectively.
Nonlinear agent interaction
Complex adaptive systems are subset of dynamic nonlinear system (McDaniel and Driebe 2001). In nonlinear agent interactions, the inputs are inversely proportional to output (Lansing 2003). In these amazing systems, small changes can results in a big change and vice versa. Mathematically, the behavior of the nonlinear system can be described as nonlinear polynomial equations.
There can be more than one attracters in nonlinear systems (Socolar 2006). These attractors are of different types with complicated limit cycles. The trajectories are restricted to areas that have unstable limit cycles.
Agentbased computing
Agentbased computing is a wide domain (Niazi and Hussain 2011). The agent here can simply a software providing any service. Or it can be fully autonomous agent whose behavior based on artificial intelligence. Agentbased computing should not be confused with other terms in artificial intelligence. Such terms are agentoriented programming, multiagent oriented programming, and agentbased modeling. These all are actually collected together in agentbased computing.
Now in the next section, we will present a review on available game theoretic literature.
Review
In the previous section, we gave an overview of game theory and presented a taxonomy of games. In this section, we will explore available game theoretic literature.
Zerosum game theoretic models
Zerosum games are the mathematical representation of conflicting situations (Washburn 2003). In these games, the total of gains and losses is equal to zero. Application of these game theoretic models can be seen in different fields like network security (Perea and Puerto 2013) and resource allocation (Zhou et al. 2011). There are also different types of games. Such as zerosum games with incomplete information and large Zerosum games.
AlTamimi et al. (2007) have discussed Qlearning designs for the zerosum game. By using a modelfree approach they obtained a solution for the game. Autopilot design for the F16 plane is performed that shows productiveness of method.
Daskalakis et al. (2015) have proposed noregret algorithm. This zerosum game theoretic algorithm achieves regret when applying against an adversary. After using the algorithm, quadratic improvement can be identified on convergence rate to game value. The lower bound for all distributed dynamics is optimal. This happens when payoff matrix information is unknown to both players. But if they know they can compute minimax strategies privately.
Bopardikar et al. (2013) have studied larger zerosum games. In these games, players have a large number of options. It proposes two algorithms. The Sampled Security Policy algorithm is to compute optimal policies. Then Sampled Security Value algorithm computes the level of confidence on the given policy.
Moulin and Vial (1978) have proposed a class of games called strategically zerosum games. These games have special payoff structure. The mixed equilibrium of these games cannot be improved. The properties of games via a large body of correlation scheme is also described.
Sorin (2011) have worked on repeated zerosum games. They described current advancement in these games especially together with differential games. They first define models of repeated games and differential games. Then they discuss issues related to these models.
Seo and Lee (2007) have considered conflicting zerosum game that involves decisionmaking process. This is an experimental study on trained monkeys. Monkeys take binary choices in the computersimulated conflicting game. The study described the decisionmaking process adaptive in both human and animals.
Zoroa et al. (2012) have modeled a perimeter patrol problem. They used Zerosum discrete search games as a framework for their study. They studied problem occurred in cylindrical surface. The problem in the linear set having cyclic order is also studied. Optimal strategies are found via computer code.
Xu and Mizukami (1994) have studied systems of state space. They obtained saddlepoint by a constructive method. It describes that there can be several saddlepoint solutions for the system. When several saddlepoints exist, this universal system differs from the state space system. They found possible conditions for the existence of saddlepoint.
Ponssard and Sorin (1980) have discussed zerosum games with incomplete information. They discussed two ways to determine information of states. It can be obtained via independent chance moves or the unique one. Unique moves cause dependence in state information. Thus, it is complicated to analyze. Several results acquired in the independent case have their equivalent in dependent one.
Chen and Larbani (2006) have proposed undetermined utility matrix game. They worked for the solution of decisionmaking problem (MADM). This decision making deals with prioritization of alternatives considering several attributes. Here weights of an MADM problem obtained with a fuzzy decision matrix. Finally, equilibrium solution is also obtained.
Li and Cruz (2009) have studied deception. They used a zerosum game model with an asymmetrical structure. This paper considers the relationship between information and decisionmaking to understand deception. In these games, the first player gets extra information. Whereas the second player has the power to inject deception. The paper also classifies deception into active deception and passive deception.
Ponssard (1975) have worked on the zerosum game in the normal form. They described that these games are equal to a linear program (LP). In these games, the player’s behavioral strategies are represented in variables. In normal form game variables are used to represent the player’s mixed strategies.
Wang and Chen (2013) have obtained feedback saddlepoint for the zerosum differential game. The game is between counterterror measure and economic growth. It uses HamiltonJacobiIsaac’s equation to obtain saddlepoint. The saddlepoint obtained, strengthens the government counterterror and weakens the terrorist organizations.
Van Zandt and Zhang (2011) have studied equilibrium value for Bayesian zerosum games. The conditions are characterized for equilibrium value and strategies. These games have a parameter to obtain payoff function and strategies for every player. The information of every player is modeled as a sub \(\upsigma\) field to obtain optimal strategies.
Marlow and Peart (2014) have studied soil acidification. They described a zerosum game between a sugar maple and American beech. The negative impact of soil acidification on sugar maple supports beech in the game. The model lay down the findings of this study and other evidence of soil acidification. The results suggest reexamining the costeffectiveness of chemical remediation.
2player zerosum games
Mertens and Zamir (1971) have also discussed the twoperson zerosum game with incomplete information. These games are studied in a repetitive form. As a result, the game value is obtained with n repetitions. This is previously discussed by Harsanyi. However, still this paper is completely independent on its own.
Chang and Marcus (2003) have studied twoperson zerosum game. They considered optimal equilibrium game value and then analyzed error bounds. After that, they discussed methods that calculate the value of subgame.
MéndezNaya (1996) have discussed 2players continuous games. These games have set of pure strategies. These games also have rightsided semiopen real intervals and continuous payoff functions. The paper described conditions for game value in the mixed game. It is proved that there is no assurance that mixed extended Zerosum game has a value but there can be a value.
QingLai et al. (2009) have proposed an algorithm for 2D systems. It solves twoplayers zerosum games. It obtains saddlepoint by using adaptive critic technique. The optimal control policies have been computed using neural networks. The algorithm can be implemented without system model.
Zhang et al. (2011) have proposed an iterative algorithm. It obtains optimal solutions for the nonaffine nonlinear zerosum game. This is a twoplayer game with quadratic performance index. One player minimizes the performance index while other maximizes it. This study held to facilitate this minimax problem. The optimal strategy has obtained an order of state trajectories and Riccati differential equations. Finally, the simulation shows successful results of this iterative method.
Gensbittel (2014) has worked on zerosum incomplete information games. The author extended the CAV (U) Theorem of Aumaan–Maschler (Aumann et al. 1995). In this paper, the presented results are for infinite repeated games. Finally, the paper provides optimal strategies for players in 2players game having length n.
Bettiol et al. (2006) have considered Zerosum state constrained differential games. The study proves bolza problem for twoplayer differential games. It shows that lower semicontinuous value function exists in differential games. The optimal strategy is created and the value function is characterized by viscosity solutions.
Beyond 2player zerosum games
Initially, the zerosum game is a 2player game (Von Neumann and Morgenstern 1953). In which one player has to win and other has to loose the game. The following papers show that researchers have worked on beyond 2player game.
Moulin (1976) has worked on beyond 2player Zerosum games. First, this study describes a large family of abstract extension. Then these extensions are classified based on information exchanged. Finally, characterization of all possible values gained from this abstract extension is described.
Okamura et al. (1984) have studied threeplayer zerosum games. They investigated the learning of the behavior of variablestructure stochastic automata in a game. These automata have learning capabilities and can update their actions. The players have a lack of information of payoff matrix. After every play, the environment, responds to automaton actions. After this, players update their strategies.
Decision theorems
Sauder and Geraniotis (1994) have worked on maximin and minimax theorems. They formulated signal detection process as twoplayers zerosum game. The twoplayers are the detector designer and the signal designer. The signal detection problem arises when analyzing the signal is genuine or deceptive. Finally, results are validated via simulation.
Hellman (2013) have focused on rational belief system. The study got the basis from the work of Aumann and Dreze. They described that players have common knowledge of rationality. Whereas in this article, it is argued that there is no need of common rationality. Finally, it is shown that the expected payoff in the game is only the minimax value.
Ponssard (1976) have discussed minimax strategies. These are prohibited to give particular solutions in optimal zerosum game play. This study finds a strategy to be used after the mistake carries out in play. There are two approaches proposed to get optimal strategies. The first approach arrived from perturbed games. The second approach established on the basis of the lexicographic application. If the opponent ignores mistakes, the strategy will remain optimal as it does not turn to give a loss.
Gawlitza et al. (2012) have proposed two strategy improvement algorithms for static program analysis. One is maxstrategy and the other is minstrategy for static program analysis. These algorithms perform within a common general framework to solve vcam cave equations.
Rock paper scissors
Sinervo and Lively (1996) have used cyclic RPS game in a biological study. By using this zerosum model they studied three different strategies of male sideblotch lizards. It studies territory use and patterns of sexual selection on male sideblotch lizards.
Bahel and Haller (2013) have computed Nash equilibria of cyclic RPS game. They characterized Nash equilibria into two sets. With an even number of actions, an infinity of Nash equilibria exists. On the second set with an odd number of actions unique Nash equilibria is found. This paper studies the strength of Nash equilibria.
Frey et al. (2013) have studied complex dynamics in social and economic systems. This is realized by analyzing agents independently playing a multiplayer mod game. The game is like the rock paper scissors. The behavior of players in human groups is nonfluctuating and effective. In this game the periodic behavior is stable.
Batt (1999) has also studied the model of Rock Paper Scissors game and has presented insights of the game having an efficient outcome with few conflicts. The game players are biased for being a winner. This game is not efficient with major conflicts. For that other approaches like coinflip is the best choice.
Neumann and Schuster (2007) have used a zerosum rock scissor paper game as a framework. By which they modeled the process of bacteriocin producing bacteria. The game is examined for three strains. These are of E. coli, bacteriocin producer, resistant and sensitive. They derived stability criteria for these strains. The paper actually proposes Lotka–Volterra system model of the RPS game.
Duersch et al. (2012) have obtained Nash equilibrium for the 2player symmetric game. There is no pure equilibrium exists in RPS game. They found that pure equilibrium strategy exists only in nongeneralized rock paper scissors game. It also showed that pure equilibrium exists for the 2player finite symmetric game.
Cake cutting
Procaccia (2013) have discussed cake cutting game. They described that it is a powerful tool to divide heterogeneous goods and resources. Cake cutting algorithm looks for formal fairness in the division of heterogeneous divisible goods. But the design of these algorithms is a complex task for computer scientists.
Edmonds and Pruhs (2006) have proposed a randomized algorithm that considers cake cutting algorithm. It equally allocates resources between n numbers of players. This algorithm needs honesty of players.
Matching penny
McCabe et al. (2000) have studied threeperson matching pennies game. It examines knowledge of player about other player’s payoffs and actions. The Naive Bayesian learning and sophisticated Bayesian learning are studied in this context. These approaches examine that estimated mixed strategies can be played or not. Results showed that players do not use sophisticated Bayesian learning to obtain Nash equilibrium.
Stein et al. (2010) have studied mixed extension of matching pennies, a zerosum game. This study constructs examples to support polynomial games. Here Nash equilibria are representable as finitely moments. Whereas polynomial games cannot be represented as finitely moments.
Colonel Blotto
Roberson (2006) described the remarkable equilibrium payoffs in the Colonel Blotto game. It considers both symmetric and asymmetric cases of the zerosum game. The proportion of won battlefields is the payoff of player.
Hart (2008) have studied Discrete Colonel Blotto game. This is a Zerosum game with the symmetric case for which optimal strategy is obtained. Both of these games deal with the conflicting environment.
Kuhn Poker
Kuhn Poker is a simplified form of Poker developed by Harold W. Kuhn (Tucker 1959). In this 2player game, the deck includes only three cards. One card is distributed to each player. The first player has to bet or pass then the second player may bet or pass. On a bet, the next player must bet also. When both players pass or bet then the player with the highest card will win the pot.
Southey et al. (2009) have studied Kuhn Poker game. There main concern is opponent modeling in the game. They studied two algorithms, expert and parameter estimation. Their experiment showed that learning methods do not give good results in the small game.
Princess Monster
Wilson (1972) has developed this game on a circle. Princess and Monster move on a circle either clockwise or anticlockwise. If both players move in the same direction, the game state does not change. But if they move in opposite directions then there will be a point on the circle on which both reach at the same time. At that point, Princess got captured and Monster wins.
Solution concepts
We have discussed before that game describes strategic interactions. In game theory, the solution concept is like a rule by which game theorists seeks how the game will be played. The Nash equilibrium, Pareto optimality, and Shapley values are different known solution concepts. These concepts are used to formally predict that how the game will be played.
Nash equilibrium of games
Husband  Wife  

Football  Music  
Footbal  (3,1)  (0,0) 
Music  (0,0)  (1,3) 
Singh and Hemachandra (2014) have studied Nash equilibrium for stochastic games with independent state processes. This study got basis from the work of Altman et al. 2008. They worked on Nplayer Constrained Stochastic games.
Grauberger and Kimms (2014) have computed Nash equilibria for network revenue management games. This study investigates network management competition. A heuristic is presented for computing Optimal Capacity allocations. It also computes Nash equilibria in nonzerosum games. It computes approximate to exact Nash equilibrium. They used the linear continuous model to reduced computational time.
Gharesifard and Cortes (2013) have considered a network based scenario and obtained a Nash solution. Network’s aim is to maximize or minimize a common objective function. The two players are two network agents. They have their objectives to achieve network’s aim. Both agents with opposite aims make a zerosum game between them. Each network’s saddlepoint dynamics implemented by both network’s through local interactions. The saddlepoint dynamics for concaveconvex class converges to Nash equilibrium. This saddlepoint dynamics do not work to converge directed networks.
Porter et al. (2008) have proposed two search methods that calculate Nash equilibrium. One method is for the twoplayer game and the second method is for the nplayer game. Both methods uses backtracking approaches to search the space of small and balanced support. These methods are tested on different games. Results showed positive performance of these methods. Another approach the Lemke–Houson algorithm for twoplayer games also discussed here.
Rosenthal (1974) have obtained correlated equilibria for 2player games. These are more general strategies than Nash equilibrium known as correlated equilibrium. There can be a player who prefers correlated equilibria on Nash equilibrium. If this so, then correlated equilibria is a convenient solution. If the game is the best response then the correlated equilibria are not the right solution. It is good for the competitive games.
Hu and Wellman (2003) have computed Nash equilibrium for the generalsum stochastic game. They proposed a method for a multiagent Qlearning. The method NashQ generalizes Qlearning of singleagent to the multiagent environment. It updates its Qfunction by assuming Nash equilibrium actions as a choice of agents. It is shown that Nash Q provides efficiency to get equilibrium on singleagent Qlearning. This is an offline learning process. The online version of this learning process is also implemented.
Maeda (2003) have considered games that have fuzzy payoffs. They first characterize equilibrium strategies as Nash equilibrium strategies. Then they examine characteristics of game values of fuzzy matrix games. Finally, they demonstrated this approach via numerical example.
Athey (2001) have studied games known as games of incomplete information. They proposed a restriction called single crossing condition (SCC) for these games. The Pure Strategy Nash equilibrium with a finite set of actions exists if SCC is satisfied. In these games, players have private information of their own. The results of this study show nondecreasing Pure Strategy Nash equilibrium. The proposed approach is constructive. So that the equilibria can be calculated for finite action games easily.
Pareto optimality
Pareto optimality introduced by Vilfredo Pareto (Yeung 2006). In Pareto optimal game, there exists a strategy that increases player’s gain without damaging others. For example, when Economy is competitive perfectly then it is Pareto optimal. This is because no changes in the Economy can make better the gain of one person and can make worse the gain of another person at the same time.
Feldman (1973) has discussed Pareto Optimality in bilateral barter. The proved the constraints under which trade moves go on to pairwise optimal allocation. Then this paper discussed some general conditions by which these allocations are Pareto optimal.
Kacem et al. (2002) have solved the flexible jobshop scheduling problem.by using hybrid Pareto approach. Their proposed approach combines Fuzzy logic and evolutionary algorithms. This combination minimizes machine workloads and completion time.
Guesnerie (1975) have discussed insights of nonconvex economics. The paper characterizes Paretooptimal states. Then analyze how to achieve them in distributed economy. The focus of this paper mainly concerns with conditions needed for optimality, marginal cost pricing rules, and decentralized nonconvex economy.
Shapley values
 1.
Red player, blue player
 2.
Red player, green player.
Littlechild and Owen (1973) discussed the problem of computing Shapley value for large games. They considered the work of Broker and Thompson of about aircraft landing charges on the airport. This paper presents an expression that can be calculated when the cost function is a characteristics function. The costs of the biggest player in any subset of players is equal to the cost of that subset.
Gul (1989) has worked on the bargaining problem in a transferable utility economy. A framework is established by which the two approaches, cooperative and noncooperative, are compared. The stationary subgame perfect Nash equilibrium is used and with small time intervals, the gain is the Shapley value for the agent.
PérezCastrillo and Wettstein (2001) have proposed a mechanism to analyze how cooperation produces surplus. It is a twophased play. The first phase is of bidding that gives the winner of the game. In the second phase the winner is rejected then the game is again played without that winner. This paper describes that the payoff of the game coexists with Shapley value.
Decision theory
Parsons and Wooldridge (2002) have discussed both game and decision theories. As game theory studies agent’s interaction, it is closed relative to decision theory. Decision theory seeks to get the most favorable choice. That can maximize utilities of decision makers. Whereas the game theory also studies selfinterested agents. It takes agents as greedy players want to maximize their own gain. This paper reviewed existing literature. Then it revealed issues related to autonomous agents and multiagent system.
Hart et al. (1994) have worked on the twoperson zerosum game. They obtained game value and derived utility simultaneously by using decision theory. They found the gap between the axioms and presumption about expected utility maximization. Axioms characterize expected utility maximization, considering risk, in the individual decision. The presumption is that expected utility maximizers evaluate the game by their value. This study does not fill this gap completely. Because rationality involves playing maximin strategies is not proved.
Game theory in computer science
Roughgarden (2010) have described Algorithmic Game Theory (AGT), a game theory applications in computer science. This paper explores current research formats in AGT. The research theme is different here than classical game theory. AGT receives the computational difficulty as a coupling requirement which makes it unique.
Wooldridge (2012) have explored the feasibility of game theory applications in computer science. They discussed issues related to the application of game theoretic models. They revealed the incorrect use of game theory model. They also mentioned that more research is needed in this area.
Ahmad and Luo (2006) have proposed an algorithm for video coding. It considers optimization of rate control. In this twolevel algorithm, the first level is about the target bits allocation. In the second level, each MB computes to share bits fairly. So that its quantization scale can be optimized.
Games in social systems
In this section, we will discuss game theory applications in social groups and others. In social groups, people interact and communicate each other. To model behaviors in such communication, game theory has been used.
Chen and Liu (2012) have modeled human behavior in social networks by using game theory. This is the study of the impact of social networks in our daily life. This generalized approach can be used for several social networks. The efficiency and fairness between users are main considerations of the model design.
Hand (1986) has discussed social conflicts and social dominance. The social dominance based on Leverage is considered here. There are personals having greater resources and personals having fewer resources as well. The paper describes that game theory can be used to make less dominant individuals equal or greater to others.
Markov games
Altman (1994) have used Markov games to control the flow of arriving packets. These are the collection of normalform games that agents play repeatedly. These games together with a value iteration algorithm are used for single controller. The controller design policies to control the flow. Markov games is another name of stochastic games. This study reveals the existence of the stationary optimal policy.
Ghosh and Goswami (2008) have studied semiMarkov game. They first transformed the model into the completely observed semiMarkov game. Then they worked and obtained saddlepoint. They showed the existence of saddlepoint but with some conditions.
Laraki et al. (2013) have discussed stochastic games, subgame perfect and Borel sets. It describes conditions for the existence of game value. With these conditions the player 2 gets an optimal strategy for subgame perfect. The conditions described that payoff is a bounded function f. The function f is measurable and is lower semicontinuous.
Deshmukh and Winston (1978) have developed zerosum model for product’s price setting in two firms. The model is based on some assumptions. That is the current price of product and market positions influenced future market positions. This provides a way to get balance benefits gained from price variations.
Sirbu (2014) has studied zerosum games. The paper discussed stochastic differential game restricted to elementary strategies. The result shows the existence of value in a game with these strategies.
Pham and Zhang (2014) have studied 2player zerosum weak formulation game. The game discussed is Stochastic and Differential game. The game value is obtained by visocsity solution. The paper showed the value of the game as a random process.
HernandezHernandez et al. (2015) have studied Stochastic Differential Equation. The game is between controller called minimizer and stopper called maximizer. The controller selects a finitevariation process. And the stopper selects time at which the game will stop. The study described that the obtained optimal strategies are not unique.
OliuBarton (2014) has worked on Finite Stochastic game. This is a zerosum game. The paper proves the presence of value in the game. The aim of the study is to provide asymptotic behavior of strategies.
Hamadène and Wang (2009) have studied Backward Stochastic Differential Equations. These equations have terms. Their resulted solution is also a stochastic or random process. The paper presents a remarkable solution and showed the value in the game.
Shmaya (2006) have studied an interesting game with one informed player. It is a twoplayer zerosum game with stochastic signals. The value of the game is taken as a function of player one’s information structure. The properties of this function, examined, shows that every player has a positive value of information in zerosum game.
Nonzerosum game models
In nonzerosum games, there exists a universally agreed solution. It means there is no single optimal solution as zerosum games have. These games model cooperation instead of conflicts. There can be a winwin solution of game where everyone is a winner. The players can play a game while cooperating each other to achieve a common goal.
Sullivan and Purushotham (2011) have discussed a highlevel summit on noncommunicable disease (NCD). The summit held in New York on September 2011 in which they discussed cancer policies. The summit recognized cancer a first highlevel disease. This paper critically examined these policies. It gives an alternative solution based on a nonzerosum game model for international cancer policy.
Bensoussan et al. (2014) have worked on the nonzerosum stochastic differential game. They modeled performance of two insurance companies. Each company is greedy to maximize its own utility. The surplus process modeled by a continuoustime Markov chain and an independent marketindex process. The game solved by a dynamic programming principle. It is also mentioned that the presented game can be extended to several directions.
Carlson and Wilson (2004) have considered failure in the management of U.S. national forest. At first, this seems a pure conflict between US National Forest Service and Environmentalists. But in this paper, a nonzerosum game theoretical model is developed. It examines the effects of these changes on outcomes. It is analyzed that some changes do not affect outcomes and some have potential impact.
Shenoy and Yu (1981) have studied partial conflict games. This study examines the reciprocative strategy to induce cooperation. Reciprocative behavior is defined as NonZerosum games. It describes conditions for cooperative behavior to give an optimal response to reciprocative behavior. The feasibility of playing reciprocative strategy is also determined. Finally, conditions are given for reciprocative strategy that results to Nash equilibrium.
Mussa (2002) have studied two monetary units, euro, and dollar. This article argues that there is a nonzerosum game between both units. It defines euro beneficial for both the euro area itself and rest of the world. Euro effects world’s economy indirectly. It is described that euro and the dollar are coequal monetary standards. And is beneficial to the United States, euro area itself and rest of the world.
SemsarKazerooni and Khorasani (2009) have studied multiagent system that considers cooperative game theory. The common goal of the multiagent team is to have consensus. Consensus can be accomplished over a common value for the agent’s output. This paper is a series of work. In this paper, a previously introduced strategy is used called semidecentralized optimal control strategy.
Khosravifar et al. (2013) have used an agentbased game theoretic model to analyze web services. There is a distributed environment in which agent cooperates each other. The performance of agents is analyzed by using nonzerosum model. The decisionmaking process is also analyzed.
Radzik (1991) have obtained purestrategy and Nash equilibrium for 2player nonzerosum games. The payoff functions are upper semicontinuous. Agents are not allowed to interact each other in the model considers here. The optimality criterion dominant is the NE vector. This vector computes optimal actions of all players considering their payoff function. The paper emphasizes solutions in pure strategies.
Radzik (1993) have computed Nash equilibria for discontinuous twoperson nonzerosum games. This study examines two classes of these games on the unit square. Here the payoff function of the first player is convex or concave in the first variable. This supposition combined with bounded payoff function entail the presence of Nash equilibria.
Games in networks
The networks provide an excellent way of communication as well as support for distributed environments. The Game theory models have their obvious applications in networkbased systems. The following papers use game theory to get optimal strategies for network problems.
Transport networks
Bell et al. (2014) have proposed a game theoretic approach for modeling degradable transport networks. By this approach, hyperpaths are generated between population centers and depot locations. They used a case study in the province of China to facilitate the proposal. Optimal hyperpaths are defined by using mixed strategy Nash equilibrium. Which give ultimate depot locations. These depot locations are found by using two forms of drop heuristic. These heuristics gives optimal solution except in one case. That is when the most appropriate location for only one rescue center is obtained.
Alpcan and Buchegger (2011) have studied vehicular networks. They examine security of network for the improvement of transportation. It is to provide optimal strategies to defend malicious threats. Three types of security games are studied here. When players knows the payoff matrices the game is a zerosum. When they know approximate payoffs the game is a fuzzy game. When players do not know each other’s payoffs, strategies can be improved via fictitious play.
Network security and reliability
Perea and Puerto (2013) have used game theory approach in network security. The game is between the network operator and attacker. The operator establishes network to achieve some goals. While the attacker wants to place damages in the network. The optimal strategy for the operator is building a network. The optimal strategy for attacker is finding edges to be attacked. This paper revealed dynamic aspects of the game.
Bell (2003) has proposed a novel method to identify failure nodes. It is a twoplayer game between a router and virtual network tester. Router has to find a leastcost path, whereas network tester wants to increase tripcost. The link in use are optimal for router and failure links are optimal for network tester. Network tester fails link to increase tripcost. So the given maximin method is to identify those links that threaten to network.
Kashyap et al. (2004) have modeled multipleinput/output fading channel communication problem as a Zerosum game. The players, maximizer and minimizer, have mutual information. On both maximizer and minimizer there is total power constraint. They obtained saddlepoint of the game. It is shown that minimizer has no need of channel input knowledge.
Wei et al. (2012) have applied game theoretic approach for a noncorrelated jamming problem. In this problem jammer has a lack of information about actually transmitted signals. There is a Zerosum game between transceiver pair and jammer in the parallel fading channel. This paper explored CSI and solved problems related to it. The study finds equilibrium based on pure strategy. The game model adopts frequency hopping to defend against jam threats.
Chen et al. (2013) have used the zerosum game model to analyze the performance of system. The approach examines communication across cooperative and malicious relays. It also analyzes the impact of this communication. The malicious relays can jam the network and they intentionally interrupt the system. The Nash equilibrium is determined to get optimal signaling strategies for cooperative relays.
Venkitasubramaniam and Tong (2012) have studied network communication. They used zerosum game theoretic approach to provide anonymity. Optimizing anonymity problem is a game between network designer and adversary. The model showed the presence of saddlepoint. The approach obtained optimal strategies by using parallel Relay networks. It explores throughput tradeoffs in large networks.
Wang and Georgios (2008) have considered Jammer and Relay problem. They modeled the problem between them as zerosum mutual information game. By assuming source and destination being unaware optimal strategies are derived for both players. In nonfading scenario Linear Relay (LR) and Linear Jammer (LJ) are optimal strategies. In fading scenario, J cannot distinguish between Jamming and source signal. So the best strategy is to jam with Gaussian noise only. Here R forward with full power when jam link is worst. They derived optimal parameters on the basis of exact Nash equilibrium.
Zhao et al. (2008) have studied Wireless Mesh Networks. They used game theoretic approach for increasing performance of MAC protocols. This is an iterative game having two steps. In the first step current state of the game is determined on each node. In a second step, the equilibrium strategy of the node is adjusted to the determined state of the game. The process is repeated till the desired performance is achieved. Finally, results are validated via simulation.
Larsson et al. (2009) have studied signal processing and communications in a game theoretic way. They demonstrated basic concepts of conflicting and cooperative game theory through three examples of interference channel model. These are SISO IFC, MISO IFC, and MIMO IFC. For conflicting case the study is limited to Nash equilibrium and price of anarchy (PoA). The Price of anarchy gives cost measures that system paid to operate without cooperation.
Nguyen et al. (2013) have used game theory to integrate distributed agentbased functions. They proposed an agentbased conceptual strategy. Which resolves the conflicting interests between product agents and network agents. The method is based on cooperative game theory that integrates and solves conflicting interests. Finally, the approach is verified by simulation with two case studies. First is like micro grid example and the second is the more complex case.
Quer et al. (2013) have used game theoretic approach to study internetwork cooperation. The scenario is about two ad hoc wireless networks. Both cooperates together to gain some benefits. Statistical correlation between local parameters and performance is computed by Bayesian networks method. Both networks share their nodes to achieve cooperation. Game theory is used in nodes selection process. The system level simulator is used to confirm results. Results showed that increase in performance can be achieved by accurate selection of nodes.
Spyridopoulos (2013) have modeled problem of cyberattacks. For that, they used Zerosum oneshot game theoretic model. Singleshot games are opposed to repeated games. These models can be used when cooperation cannot be possible among players. The study explored adjustments and ideal techniques for both assailant and keeper. The study revealed a solitary ideal method for the keeper. The ns2 network simulator is used for the simulation of the model.
Khouzani et al. (2012) have studied softwarebased operations against malware attackers. Malware has to maximize the damage. And the network has to take robust defensive strategies against attacks. This makes the game a Zerosum game. Simple robust defensive strategies are shown via dynamic game formulation. Finally, performance is evaluated through simulation.
Discretetime/continuoustime
Ye et al. (2013) have proposed a discretetime Markov chain Parrondo’s model. They analyzed model theoretically and verified via simulation. One can realize rationality and adaptability from a macro level. They showed that agitating effect of rewiring is effective than the zerosum game.
AlTamimi et al. (2007) have proposed an algorithm for the solution of a zerosum game. The algorithm provides a solution for Riccati equation. They discussed two schemes of programming. One is heuristic dynamic and second is dual. These schemes used for the solution of the value function and game costate.
Liu et al. (2013) have proposed an algorithm based on finding approximate optimal controller. It is based on the class of discretetime constrained systems. This iterative adaptive dynamic programming algorithm provides a solution for nearoptimal control problem. The control scheme has three neural networks. These networks are taken as parametric structures to assist the proposed algorithm. This is described by two examples that showed the practicality and concurrence of the algorithm.
Wu and Luo (2013) have modeled H\(\infty\) state feedback control problem as the twoperson Zerosum game. An algorithm is proposed for solving algebra rectaii equation. They developed two versions, offline and online. An offline version is a modelbased approach. The online version is a modelfree approach but partially. These approaches are validated through simulation.
AbuKhalaf et al. (2008) have used policy iteration approach together with neural networks. They provide practical solution method for suboptimal control of constrained input systems. They modeled the problem as a continuoustime zerosum game. The study showed new results and creates a leastsquaresbased algorithm for a practical solution. The proposed algorithm is applied to the RTAC nonlinear benchmark problem.
Resource allocation
Zhou et al. (2011) have modeled energy allocation problem in two phased trainingbased transmission. The model is based on the zerosum game between two phases. The two phases are training phase and transmission phase. This study is about optimal energy allocation between these two phases. The closedform solutions are derived from jammer’s view. The study proves the presence of NE for fixed training length. Finally, it discusses channel state information.
Tan et al. (2011) have discussed radio networks. They used game theory approach for fair subcarriers allocation and power allocation. The subcarrier allocation and power allocation are based on colonel blotto game. The secondary users allocate budget wisely to transmit power to win subcarriers. Power allocation and budget allocation are strategies used for fair sharing among secondary users. This paper proposed algorithms and conditions for the presence of unique NE. Finally, the results are validated through simulation.
Belmega et al. (2009) have discussed power allocation in fast fading multiple access channels. In these channels transmitters and receiver have many antennas. The study gives unique Nash equilibrium. It also gives best power allocation policies. The paper discussed two different games. In the first game, the users can adapt their temporal power allocation to their decoding rank at the receiver. The other is to optimize their spatial power allocation between their transmit antennas. Finally, results are shown via simulation.
In the next section, we will classify games in tabular structures. Then will discuss some open problems.
Discussion
We discussed game theory and its applications in different domains by exploring different papers. We described how game theory models strategic and complex interactions of selfinterested agents. We also proposed a general taxonomy of games, based on the types of game representation. The three types of game representation are Normalform, Extensiveform, and Beyond Normal/Extensive form. Then we classify games according to these representation types.
This table lists games defined in different publications
Games  References  Forms  Zerosum  Perfect  Stochastic  Repeated  Bayesian  Congestion 

RPS  
Threemorph mating  Sinervo and Lively (1996)  N  Z  I  No  No  No  No 
Extended RPS  Bahel and Haller (2013)  N  Z  I  No  No  No  No 
Mod game  Frey et al. (2013)  B  NZ  I  No  Yes  No  No 
Continuous RPS  Neumann and Schuster (2007)  N  Z  I  No  No  No  No 
Cake cutting  
Balls and bins  Edmonds and Pruhs (2006)  B  Z  P  No  Yes  No  No 
Matching pennies  
3player MP  McCabe et al. (2000)  B  Z  P/I  No  Yes  Yes  No 
Blotto games  
Colonel Blotto  Roberson (2006)  B  Z  I  No  No  No  Yes 
Discrete Colonel Blotto  Hart (2008)  B  Z  I  No  Yes  No  No 
Princess Monster  
PM on circle  Wilson (1972)  B  Z  I  No  Yes  No  No 
Poker  
Kuhn Poker  Southey et al. (2009)  E  Z  I  No  No  No  No 
Networks  
Flow control  Altman (1994)  B  Z  P  Yes  Yes  No  No 
Network revenue  Grauberger and Kimms (2014)  B  NZ  P  Yes  Yes  No  No 
Railway network  Perea and Puerto (2013)  N  Z  P  No  No  No  No 
VANET security model  Alpcan and Buchegger (2011)  B  Z  P  No  Yes  No  No 
Anonymous networking  Venkitasubramaniam and Tong (2012)  B  Z  I  No  Yes  No  No 
Jammerrelay  Wang and Georgios (2008)  B  Z  P/I  No  Yes  No  No 
Dynamic game  Khouzani et al. (2012)  B  Z  P  Yes  Yes  No  No 
Parrondo’s model  
Link A + game B  Ye et al. (2013)  E  Z  P  Yes  Yes  No  No 
Transmission  
ED vs jammer  Kashyap et al. (2004)  B  Z  I  No  Yes  No  No 
Transmission security  Chen et al. (2013)  B  Z  I  No  Yes  No  No 
Payoff games  
Average payoff  Ghosh and Goswami (2008)  B  Z  I  Yes  Yes  No  No 
Semicontinuous payoff  Laraki et al. (2013)  B  Z  I  Yes  Yes  No  Yes 
Symmetric  
Symmetric game  Duersch et al. (2012)  N  Z  I  No  No  No  No 
Mixed zerosum  
Mixedstrategy  Seo and Lee (2007)  B  Z  P  No  Yes  No  No 
Mixed zerosum  Hamadène and Wang (2009)  B  Z  I  Yes  Yes  No  No 
Searching  
AGTCS2player search  Zoroa et al. (2012)  B  Z  P  No  Yes  No  No 
Investments  
Insurance games  Bensoussan et al. (2014)  B  NZ  P  Yes  Yes  No  No 
Duopoly  
Duopoly game  Deshmukh and Winston (1978)  B  Z  I  Yes  Yes  No  No 
Others  
Web services  Khosravifar et al. (2013)  B  NZ  I  No  No  No  Yes 
Legends used in Table 3
Legends  Name 

N  Normalform 
E  Extensiveform 
B  Beyond normal/extensive 
Z  Zerosum 
NZ  Nonzerosum 
P  Perfect 
I  Imperfect 
Games in different forms of representation
S. no  Ref  Games  Normal  Extensive  Beyond N/E 

1  Threemorph mating  Sinervo and Lively (1996)  Yes  No  No 
2  Extended RPS  Bahel and Haller (2013)  Yes  No  No 
3  Mod game  Frey et al. (2013)  No  No  Yes 
4  Continuous RPS  Neumann and Schuster (2007)  Yes  No  No 
5  Balls and bins  Edmonds and Pruhs (2006)  No  No  Yes 
6  3player MP  McCabe (2000)  No  No  Yes 
7  Colonel Blotto  Roberson (2006)  No  No  Yes 
8  Discrete colonel Blotto  Hart (2008)  No  No  Yes 
9  PM on circle  Wilson (1972)  No  No  Yes 
10  Kuhn Poker  Southey et al. (2009)  No  Yes  No 
11  Flow control  Altman (1994)  No  No  Yes 
12  Network revenue  Grauberger and Kimms (2014)  No  No  Yes 
13  Railway network  Perea and Puerto (2013)  Yes  No  No 
14  VANET security model  Alpcan and Buchegger (2011)  No  No  Yes 
15  Anonymous networking  Venkitasubramaniam and Tong (2012)  No  No  Yes 
16  Jammerrelay  Wang and Georgios (2008)  No  No  Yes 
17  Networkmalware dynamic game  Khouzani et al. (2012)  No  No  Yes 
18  Link A + game B  Ye et al. (2013)  No  Yes  No 
19  ED vs jammer  Kashyap et al. (2004)  No  No  Yes 
20  Transmission security  Chen et al. (2013)  No  No  Yes 
21  Average payoff  Ghosh and Goswami (2008)  No  No  Yes 
22  Semicontinuous payoff  Laraki et al. (2013)  No  No  Yes 
23  Symmetric game  Duersch et al. (2012)  Yes  No  No 
24  Mixedstrategy  Seo and Lee (2007)  No  No  Yes 
25  Mixed zerosum  Hamadène and Wang (2009)  No  No  Yes 
26  AGTCS2player search  Zoroa et al. (2012)  No  No  Yes 
27  Insurance games  Bensoussan et al. (2014)  No  No  Yes 
28  Duopoly game  Deshmukh and Wayne (1978)  No  No  Yes 
29  Web services  Khosravifar et al. (2013)  No  No  Yes 
Open problems
We have noted that while researchers applied game theory in different domains, there is still need to further exploit game theory in the modeling of complex systems research. In computer science, there is also a need to apply game theory in the domain of resource allocation algorithms such as in clouds, Internet of Things, Cyber physical systems, and others. Cake Cutting and Colonel Blotto are quite possibly good gametheoretic resource allocation models and can thus be used in such domains. However, they have not previously been used much in these areas. Furthermore, fair allocation is still a complex task in distributed systems. With the advent of mobile, pervasive computing, and cloudbased systems, practical distributed computing requires the resolution of such dilemmas on a regular basis. In other words, there is a growing need to use game theory for practical applications in the technological domains rather than restrict it to purely theoretical applications and those too, limited to very specific and niche areas of research.
Another open area for further research is in the development of taxonomies for specific game theoretic areas. We have proposed a general taxonomy of games. We have also mentioned few previously defined taxonomies. However, there is a need for the development of more taxonomies of games. These include the development of taxonomies and review of papers and games such as in the domain of Bayesian games, Congestion games among others.
Conclusions and future work
This paper presents a review of game theory models from the agentbased modeling perspective. We have discussed different classes of games such as Zerosum, Perfect information, Bayesian, Congestion etc. We have also explored the importance and nature of game theory by means of a novel taxonomy. The presented taxonomy of game classes has been based on types of game representation. In the review, game theory applications in different fields has also been discussed. We believe that this review will help multidiscplinary researchers in expanding their knowledge about the stateoftheart in game theory. In particular, it will help researchers to look at gametheoretic literature analyzed from the perspective of agents and complexity.
Declarations
Authors' contributions
AF and MN both contributed equally in the paper. Both authors read and approved the final manuscript.
Competing interests
The authors declare that they have no competing interests.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Authors’ Affiliations
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