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: "on geometric spanners of euclidean and unit disk graphs"
  Abstract: We consider the problem of constructing bounded-degree planar geometric spanners of Euclidean and unit-disk graphs. It is well known that the Delaunay subgraph is a planar geometric spanner with stretch factor $C_{del\approx 2.42$; however, its degree may not be bounded. Our first result is a very simple linear time algorithm for constructing a subgraph of the Delaunay graph with stretch factor $\rho =1+2\pi(k\cos{\frac{\pi{k)^{-1$ and degree bounded by $k$, for any integer parameter $k\geq 14$. This result immediately implies an algorithm for constructing a planar geometric spanner of a Euclidean graph with stretch factor $\rho \cdot C_{del$ and degree bounded by $k$, for any integer parameter $k\geq 14$. Moreover, the resulting spanner contains a Euclidean Minimum Spanning Tree (EMST) as a subgraph. Our second contribution lies in developing the structural results necessary to transfer our analysis and algorithm from Euclidean graphs to unit disk graphs, the usual model for wireless ad-hoc networks. We obtain a very simple distributed, {\em strictly-localized algorithm that, given a unit disk graph embedded in the plane, constructs a geometric spanner with the above stretch factor and degree bound, and also containing an EMST as a subgraph. The obtained results dramatically improve the previous results in all aspects, as shown in the paper.

Connected through hyperedge HE-1 (induced by source paper "sparse hop spanners for unit disk graphs"):
  with members:
    - "lower bounds on the dilation of plane spanners"

Connected through hyperedge HE-2 (induced by source paper "plane hop spanners for unit disk graphs simpler and better"):
  with members:
    - "on plane constrained bounded degree spanners"

Connected through hyperedge HE-3 (induced by source paper "degree four plane spanners simpler and better"):
  with members:
    - "the stretch factor of the delaunay triangulation is less than 1 998"
    - "on the stretch factor of convex delaunay graphs"

Connected through hyperedge HE-4 (induced by source paper "towards plane spanners of degree 3"):
  with members:
    - "lower bounds on the dilation of plane spanners"
    - "the stretch factor of the delaunay triangulation is less than 1 998"

Connected through hyperedge HE-5 (induced by source paper "lower bounds on the dilation of plane spanners"):
  with members:
    - "degree four plane spanners simpler and better"
    - "the stretch factor of the delaunay triangulation is less than 1 998"
    - "computing a minimum dilation spanning tree is np hard"
    - "sparse geometric graphs with small dilation"

Connected through hyperedge HE-6 (induced by source paper "there are plane spanners of maximum degree 4"):
  with members:
    - "on plane constrained bounded degree spanners"
    - "the stretch factor of the delaunay triangulation is less than 1 998"
    - "π 2 angle yao graphs are spanners"

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.DS(Data Structures and Algorithms)