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: "choosing by means of approval preferential voting the revised approval choice"
  Abstract: We look at procedures for making a collective choice through approval-preferential voting. A new procedure of this kind is proposed that is in the spirit of Condorcet’s last ideas on elections, namely making sure that a good choice is made rather than aiming at the best choice but not being so sure about it.

Connected through hyperedge HE-1 (induced by source paper "the schulze method of voting"):
  with members:
    - "approval based elections and distortion of voting rules"
    - "a note on the complexity of manipulating weighted schulze voting"
    - "the expanding approvals rule improving proportional representation and monotonicity"
    - "the flow network method"
    - "metric distortion of social choice rules lower bounds and fairness properties"
    - "fault tolerant entity resolution with the crowd"
    - "how hard is it to control an election by breaking ties"
    - "schulze and ranked pairs voting are fixed parameter tractable to bribe manipulate and control"

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)