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: "witness gabriel graphs"
  Abstract: We consider a generalization of the Gabriel graph, the witness Gabriel graph. Given a set of vertices P and a set of witnesses W in the plane, there is an edge ab between two points of P in the witness Gabriel graph GG-(P,W) if and only if the closed disk with diameter ab does not contain any witness point (besides possibly a and/or b). We study several properties of the witness Gabriel graph, both as a proximity graph and as a new tool in graph drawing.

Connected through hyperedge HE-1 (induced by source paper "maximum matchings and minimum blocking sets in θ 6 graphs"):
  with members:
    - "spanning properties of theta theta 6"
    - "on the spanning and routing ratio of theta four"
    - "the θ 5 graph is a spanner"
    - "higher order triangular distance delaunay graphs graph theoretical properties"
    - "on the average number of edges in theta graphs"
    - "fixed orientation equilateral triangle matching of point sets"
    - "witness delaunay graphs"

Connected through hyperedge HE-2 (induced by source paper "matchings in geometric graphs"):
  with members:
    - "packing plane spanning trees and paths in complete geometric graphs"
    - "flip distance to a non crossing perfect matching"
    - "balanced partitions of 3 colored geometric sets in the plane"
    - "packing plane perfect matchings into a point set"
    - "10 gabriel graphs are hamiltonian"
    - "higher order triangular distance delaunay graphs graph theoretical properties"
    - "approximating the bottleneck plane perfect matching of a point set"
    - "fixed orientation equilateral triangle matching of point sets"

Connected through hyperedge HE-3 (induced by source paper "higher order triangular distance delaunay graphs graph theoretical properties"):
  with members:
    - "10 gabriel graphs are hamiltonian"
    - "fixed orientation equilateral triangle matching of point sets"
    - "on the stretch factor of convex delaunay graphs"

Connected through hyperedge HE-4 (induced by source paper "matching in gabriel graphs"):
  with members:
    - "higher order triangular distance delaunay graphs graph theoretical properties"
    - "fixed orientation equilateral triangle matching of point sets"

Connected through hyperedge HE-5 (induced by source paper "proximity drawings of high degree trees"):
  with members:
    - "witness delaunay graphs"
    - "the geometric thickness of low degree graphs"

Connected through hyperedge HE-6 (induced by source paper "witness rectangle graphs"):
  with members:
    - "witness delaunay graphs"

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.CG(Computational Geometry)