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: "hsep heterogeneity aware hierarchical stable election protocol for wsns"
  Abstract: Wireless Sensor Networks (WSNs) are increasing to handle complex situations and functions. In these networks some of the nodes become Cluster Heads (CHs) which are responsible to aggregate data of from cluster members and transmit it to Base Stations (BS). Those clustering techniques which are designed for homogenous network are not enough efficient for consuming energy. Stable Election Protocol (SEP) introduces heterogeneity in WSNs, consisting of two type of nodes. SEP is based on weighted election probabilities of each node to become CH according to remaining energy of nodes. We propose Heterogeneity-aware Hierarchal Stable Election Protocol (HSEP) having two level of energies. Simulation results show that HSEP prolongs stability period and network lifetime, as compared to conventional routing protocols and having higher average throughput than selected clustering protocols in WSNs.

Connected through hyperedge HE-1 (induced by source paper "modleach a variant of leach for wsns"):
  with members:
    - "q leach a new routing protocol for wsns"
    - "beenish balanced energy efficient network integrated super heterogeneous protocol for wireless sensor networks"
    - "east energy efficient adaptive scheme for transmission in wireless sensor networks"
    - "energy efficient sleep awake aware eesaa intelligent sensor network routing protocol"
    - "tsep threshold sensitive stable election protocol for wsns"
    - "analyzing energy efficiency and route selection of multi level hierarchal routing protocols in wsns"
    - "survey of extended leach based clustering routing protocols for wireless sensor networks"

Connected through hyperedge HE-2 (induced by source paper "beenish balanced energy efficient network integrated super heterogeneous protocol for wireless sensor networks"):
  with members:
    - "ceec centralized energy efficient clustering a new routing protocol for wsns"
    - "energy efficient sleep awake aware eesaa intelligent sensor network routing protocol"
    - "tsep threshold sensitive stable election protocol for wsns"
    - "on performance evaluation of variants of deec in wsns"
    - "survey of extended leach based clustering routing protocols for wireless sensor networks"

Connected through hyperedge HE-3 (induced by source paper "srp ms a new routing protocol for delay tolerant wireless sensor networks"):
  with members:
    - "ceec centralized energy efficient clustering a new routing protocol for wsns"
    - "on performance evaluation of variants of deec in wsns"

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.NI(Networking and Internet Architecture)