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: "peer to peer and community based markets a comprehensive review"
  Abstract: The advent of more proactive consumers, the so-called "prosumers", with production and storage capabilities, is empowering the consumers and bringing new opportunities and challenges to the operation of power systems in a market environment. Recently, a novel proposal for the design and operation of electricity markets has emerged: these so-called peer-to-peer (P2P) electricity markets conceptually allow the prosumers to directly share their electrical energy and investment. Such P2P markets rely on a consumer-centric and bottom-up perspective by giving the opportunity to consumers to freely choose the way they are to source their electric energy. A community can also be formed by prosumers who want to collaborate, or in terms of operational energy management. This paper contributes with an overview of these new P2P markets that starts with the motivation, challenges, market designs moving to the potential future developments in this field, providing recommendations while considering a test-case.

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 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"
    - "auction mechanisms in cloud fog computing resource allocation for public blockchain networks"

Connected through hyperedge HE-2 (induced by source paper "blockchain technologies for smart energy systems fundamentals challenges and solutions"):
  with members:
    - "a first look at identity management schemes on the blockchain"
    - "implicit consensus blockchain with unbounded throughput"
    - "blockchain based smart contracts a systematic mapping study"
    - "untangling blockchain a data processing view of blockchain systems"

Connected through hyperedge HE-3 (induced by source paper "distributed algorithms for internet of things enabled prosumer markets a control theoretic perspective"):
  with members:
    - "communication efficient distributed multi resource allocation"
    - "on the control of agents coupled through shared resources"
    - "the value of distributed energy resources for heterogeneous residential consumers"
    - "dynamic policies for cooperative networked systems"
    - "on the efficiency of sharing economy networks"

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.CY(Computers and Society)