human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "nash equilibria in voronoi games on graphs"
  Abstract: In this paper we study a game where every player is to choose a vertex (facility) in a given undirected graph. All vertices (customers) are then assigned to closest facilities and a player's payoff is the number of customers assigned to it. We show that deciding the existence of a Nash equilibrium for a given graph is NP-hard which to our knowledge is the first result of this kind for a zero-sum game. We also introduce a new measure, the social cost discrepancy, defined as the ratio of the costs between the worst and the best Nash equilibria. We show that the social cost discrepancy in our game is Omega(sqrt(n/k)) and O(sqrt(kn)), where n is the number of vertices and k the number of players.

Connected through hyperedge HE-1 (induced by source paper "from hotelling to load balancing approximation and the principle of minimum differentiation"):
  with members:
    - "shapley facility location games"
    - "hotelling downs model with limited attraction"
    - "location games on networks existence and efficiency of equilibria"
    - "on voting and facility location"
    - "voronoi game on graphs"
    - "on the power of deterministic mechanisms for facility location games"

Connected through hyperedge HE-2 (induced by source paper "complexity of equilibrium in diffusion games on social networks"):
  with members:
    - "opinion maximization in social networks"
    - "opinion dynamics in social networks a local interaction game with stubborn agents"
    - "competitive contagion in networks"
    - "on the non progressive spread of influence through social networks"

Connected through hyperedge HE-3 (induced by source paper "optimal versus nash equilibrium computation for networked resource allocation"):
  with members:
    - "on dynamics in selfish network creation"
    - "competitive contagion in networks"
    - "greedy facility location algorithms analyzed using dual fitting with factor revealing lp"

Connected through hyperedge HE-4 (induced by source paper "multi player diffusion games on graph classes"):
  with members:
    - "finding safe strategies for competitive diffusion on trees"
    - "complexity of equilibrium in diffusion games on social networks"

Connected through hyperedge HE-5 (induced by source paper "computational complexity of competitive diffusion on un weighted graphs"):
  with members:
    - "complexity of equilibrium in diffusion games on social networks"

Connected through hyperedge HE-6 (induced by source paper "voronoi game on graphs"):
  with members:
    - "the one round voronoi game replayed"

Connected through hyperedge HE-7 (induced by source paper "more about base station location games"):
  with members:
    - "spatial sinr games combining base station placement and mobile association"
    - "on the continuous fermat weber problem"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.GT(Computer Science and Game Theory)