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: "multihop routing in ad hoc networks"
  Abstract: This paper presents a dual method of closed-form analysis and lightweight simulation that enables an evaluation of the performance of mobile ad hoc networks that is more realistic, efficient, and accurate than those found in existing publications. Some features accommodated by the new analysis are shadowing, exclusion and guard zones, and distance-dependent fading. Three routing protocols are examined: least-delay, nearest-neighbor, and maximum-progress routing. The tradeoffs among the path reliabilities, average conditional delays, average conditional number of hops, and area spectral efficiencies are examined.

Connected through hyperedge HE-1 (induced by source paper "optimal and suboptimal routing based on partial csi in random ad hoc networks"):
  with members:
    - "ergodic spectral efficiency in mimo cellular networks"
    - "random linear multihop relaying in a general field of interferers using spatial aloha"
    - "a selection region based routing protocol for random mobile ad hoc networks"
    - "random access transport capacity"

Connected through hyperedge HE-2 (induced by source paper "performance comparisons of geographic routing protocols in mobile ad hoc networks"):
  with members:
    - "performance analysis of geographic routing protocols in ad hoc networks"
    - "an upper bound on multihop transmission capacity with dynamic routing selection"
    - "the outage probability of a finite ad hoc network in nakagami fading"
    - "throughput delay reliability tradeoff with arq in wireless ad hoc networks"
    - "random access transport capacity"
    - "spatial and temporal correlation of the interference in aloha ad hoc networks"

Connected through hyperedge HE-3 (induced by source paper "unicast barrage relay networks outage analysis and optimization"):
  with members:
    - "effect of spatial interference correlation on the performance of maximum ratio combining"
    - "analysis of multi cell downlink cooperation with a constrained spatial model"
    - "analysis and optimization of a frequency hopping ad hoc network in rayleigh fading"
    - "the outage probability of a finite ad hoc network in nakagami fading"

Connected through hyperedge HE-4 (induced by source paper "performance analysis of geographic routing protocols in ad hoc networks"):
  with members:
    - "the outage probability of a finite ad hoc network in nakagami fading"

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.IT(Information Theory)