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: "a game theoretic approach to energy trading in the smart grid"
  Abstract: Electric storage units constitute a key element in the emerging smart grid system. In this paper, the interactions and energy trading decisions of a number of geographically distributed storage units are studied using a novel framework based on game theory. In particular, a noncooperative game is formulated between storage units, such as PHEVs, or an array of batteries that are trading their stored energy. Here, each storage unit's owner can decide on the maximum amount of energy to sell in a local market so as to maximize a utility that reflects the tradeoff between the revenues from energy trading and the accompanying costs. Then in this energy exchange market between the storage units and the smart grid elements, the price at which energy is traded is determined via an auction mechanism. The game is shown to admit at least one Nash equilibrium and a novel proposed algorithm that is guaranteed to reach such an equilibrium point is proposed. Simulation results show that the proposed approach yields significant performance improvements, in terms of the average utility per storage unit, reaching up to 130.2% compared to a conventional greedy approach.

Connected through hyperedge HE-1 (induced by source paper "when energy trading meets blockchain in electrical power system the state of the art"):
  with members:
    - "blockchain technologies for the internet of things research issues and challenges"
    - "decentralized p2p energy trading under network constraints in a low voltage network"
    - "on the applicability of distributed ledger architectures to peer to peer energy trading framework"
    - "peer to peer and community based markets a comprehensive review"
    - "peer to peer energytrade a distributed private energy trading platform"
    - "secure and privacy friendly local electricity trading and billing in smart grid"
    - "peer to peer energy trading with sustainable user participation a game theoretic approach"
    - "privacy preserving and efficient aggregation based on blockchain for power grid communications in smart communities"

Connected through hyperedge HE-2 (induced by source paper "distributed bilevel energy allocation mechanism with grid constraints and hidden user information"):
  with members:
    - "an iterative on line auction mechanism for aggregated demand side participation"
    - "a day ahead market energy auction for distribution system operation"
    - "distribution market clearing and settlement"
    - "prioritizing consumers in smart grid a game theoretic approach"

Connected through hyperedge HE-3 (induced by source paper "decentralized p2p energy trading under network constraints in a low voltage network"):
  with members:
    - "exogenous approach to grid cost allocation in peer to peer electricity markets"
    - "a study of energy trading in a low voltage network centralised and distributed approaches"
    - "a component based dual decomposition method for the opf problem"
    - "a fast distributed algorithm for large scale demand response aggregation"
    - "efficient computation of sensitivity coefficients of node voltages and line currents in unbalanced radial electrical distribution networks"

Connected through hyperedge HE-4 (induced by source paper "reinforcement learning based energy trading for microgrids"):
  with members:
    - "incentivizing energy trading for interconnected microgrids"
    - "joint investment and operation of microgrid"
    - "hierarchical decision making in electricity grid management"
    - "three party energy management with distributed energy resources in smart grid"

Connected through hyperedge HE-5 (induced by source paper "incentivizing energy trading for interconnected microgrids"):
  with members:
    - "optimal power cost management using stored energy in data centers"

Connected through hyperedge HE-6 (induced by source paper "model predictive control for smart grids with multiple electric vehicle charging stations"):
  with members:
    - "load shifting in the smart grid to participate or not"
    - "cost minimization of charging stations with photovoltaics an approach with ev classification"

Connected through hyperedge HE-7 (induced by source paper "stochastic games for smart grid energy management with prospect prosumers"):
  with members:
    - "load shifting in the smart grid to participate or not"
    - "towards a consumer centric grid a behavioral perspective"
    - "cumulative prospect theory meets reinforcement learning prediction and control"
    - "integrating energy storage into the smart grid a prospect theoretic approach"
    - "cooperation and storage tradeoffs in power grids with renewable energy resources"
    - "optimal power cost management using stored energy in data centers"
    - "learning equilibria with partial information in decentralized wireless networks"

Connected through hyperedge HE-8 (induced by source paper "analysis of demand control policies using an agent based multi layer power system model"):
  with members:
    - "why smart appliances may result in a stupid energy grid"
    - "dynamics of complex systems built as coupled physical communication and decision layers"
    - "agent based model for spot and balancing electricity markets"
    - "models for the modern power grid"

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)