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: "optimal polygonal representation of planar graphs"
  Abstract: In this paper, we consider the problem of representing graphs by polygons whose sides touch. We show that at least six sides per polygon are necessary by constructing a class of planar graphs that cannot be represented by pentagons. We also show that the lower bound of six sides is matched by an upper bound of six sides with a linear-time algorithm for representing any planar graph by touching hexagons. Moreover, our algorithm produces convex polygons with edges having at most three slopes and with all vertices lying on an O(n)xO(n) grid.

Connected through hyperedge HE-1 (induced by source paper "homothetic triangle representations of planar graphs"):
  with members:
    - "dushnik miller dimension of td delaunay complexes"
    - "planar graphs as l intersection or l contact graphs"
    - "computing cartograms with optimal complexity"
    - "on touching triangle graphs"

Connected through hyperedge HE-2 (induced by source paper "on string contact representations in 3d"):
  with members:
    - "contact representations of sparse planar graphs"
    - "contact representations of graphs in 3d"
    - "balanced circle packings for planar graphs"

Connected through hyperedge HE-3 (induced by source paper "a note on plus contacts rectangular duals and box orthogonal drawings"):
  with members:
    - "balanced circle packings for planar graphs"

Connected through hyperedge HE-4 (induced by source paper "pixel and voxel representations of graphs"):
  with members:
    - "1 visibility representations of 1 planar graphs"
    - "bar 1 visibility graphs and their relation to other nearly planar graphs"
    - "equilateral l contact graphs"
    - "on triangulating k outerplanar graphs"
    - "computing cartograms with optimal complexity"
    - "rectangular layouts and contact graphs"

Connected through hyperedge HE-5 (induced by source paper "contact representations of sparse planar graphs"):
  with members:
    - "planar lombardi drawings for subcubic graphs"
    - "minimum weight triangulation is np hard"
    - "optimal moebius transformations for information visualization and meshing"

Connected through hyperedge HE-6 (induced by source paper "simultaneous straight line drawing of a planar graph and its rectangular dual"):
  with members:
    - "simultaneous embedding of planar graphs"
    - "simultaneous embedding of a planar graph and its dual on the grid"

Connected through hyperedge HE-7 (induced by source paper "on contact graphs with cubes and proportional boxes"):
  with members:
    - "rectangular layouts and contact graphs"

Connected through hyperedge HE-8 (induced by source paper "balanced circle packings for planar graphs"):
  with members:
    - "strict confluent drawing"
    - "the galois complexity of graph drawing why numerical solutions are ubiquitous for force directed spectral and circle packing drawings"
    - "planar lombardi drawings for subcubic graphs"
    - "optimal moebius transformations for information visualization and meshing"

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)