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: "bidimensionality and eptas"
  Abstract: Bidimensionality theory is a powerful framework for the development of metaalgorithmic techniques. It was introduced by Demaine et al. as a tool to obtain sub-exponential time parameterized algorithms for problems on H-minor free graphs. Demaine and Hajiaghayi extended the theory to obtain PTASs for bidimensional problems, and subsequently improved these results to EPTASs. Fomin et. al related the theory to the existence of linear kernels for parameterized problems. In this paper we revisit bidimensionality theory from the perspective of approximation algorithms and redesign the framework for obtaining EPTASs to be more powerful, easier to apply and easier to understand. #R##N#Two of the most widely used approaches to obtain PTASs on planar graphs are the Lipton-Tarjan separator based approach, and Baker's approach. Demaine and Hajiaghayi strengthened both approaches using bidimensionality and obtained EPTASs for a multitude of problems. We unify the two strenghtened approaches to combine the best of both worlds. At the heart of our framework is a decomposition lemma which states that for "most" bidimensional problems, there is a polynomial time algorithm which given an H-minor-free graph G as input and an e > 0 outputs a vertex set X of size e * OPT such that the treewidth of G n X is f(e). Here, OPT is the objective function value of the problem in question and f is a function depending only on e. This allows us to obtain EPTASs on (apex)-minor-free graphs for all problems covered by the previous framework, as well as for a wide range of packing problems, partial covering problems and problems that are neither closed under taking minors, nor contractions. To the best of our knowledge for many of these problems including cycle packing, vertex-h-packing, maximum leaf spanning tree, and partial r-dominating set no EPTASs on planar graphs were previously known.

Connected through hyperedge HE-1 (induced by source paper "improved in approximability bounds for d scattered set"):
  with members:
    - "kernelization and approximation of distance r independent sets on nowhere dense graphs"
    - "structurally parameterized d scattered set"
    - "on distance d independent set and other problems in graphs with few minimal separators"
    - "time approximation trade offs for inapproximable problems"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"
    - "independent set induced matching and pricing connections and tight subexponential time approximation hardnesses"
    - "exponential time approximation of hard problems"

Connected through hyperedge HE-2 (induced by source paper "baker game and polynomial time approximation schemes"):
  with members:
    - "thin graph classes and polynomial time approximation schemes"
    - "approximation algorithms for polynomial expansion and low density graphs"
    - "simple ptas s for families of graphs excluding a minor"
    - "deciding first order properties of nowhere dense graphs"

Connected through hyperedge HE-3 (induced by source paper "maximum cut parameterized by crossing number"):
  with members:
    - "an fpt algorithm for max cut parameterized by crossing number"
    - "a fixed parameter algorithm for the max cut problem on embedded 1 planar graphs"
    - "graph isomorphism for bounded genus graphs in linear time"
    - "computing crossing numbers in quadratic time"

Connected through hyperedge HE-4 (induced by source paper "a ptas for subset tsp in minor free graphs"):
  with members:
    - "truly optimal euclidean spanners"
    - "greedy spanners are optimal in doubling metrics"
    - "on subexponential parameterized algorithms for steiner tree and directed subset tsp on planar graphs"
    - "minor free graphs have light spanners"
    - "the greedy spanner is existentially optimal"
    - "linear size distance preservers"
    - "graph minors for preserving terminal distances approximately lower and upper bounds"
    - "a light metric spanner"

Connected through hyperedge HE-5 (induced by source paper "local search is a ptas for feedback vertex set in minor free graphs"):
  with members:
    - "local search yields approximation schemes for k means and k median in euclidean and minor free metrics"
    - "approximation algorithms for polynomial expansion and low density graphs"
    - "simple ptas s for families of graphs excluding a minor"
    - "solving the undirected feedback vertex set problem by local search"
    - "approximation algorithms for maximum independent set of pseudo disks"
    - "separator theorems for minor free and shallow minor free graphs with applications"
    - "eigenvalue bounds spectral partitioning and metrical deformations via flows"

Connected through hyperedge HE-6 (induced by source paper "an fpt 2 approximation for tree cut decomposition"):
  with members:
    - "constructive algorithm for path width of matroids"
    - "finding topological subgraphs is fixed parameter tractable"

Connected through hyperedge HE-7 (induced by source paper "finding hitting and packing cycles in subexponential time on unit disk graphs"):
  with members:
    - "subexponential parameterized algorithms for planar and apex minor free graphs via low treewidth pattern covering"
    - "bidimensionality and kernels"
    - "approximation algorithms for polynomial expansion and low density graphs"
    - "mixing color coding related techniques"
    - "bidimensionality and geometric graphs"
    - "narrow sieves for parameterized paths and packings"
    - "minimum clique partition in unit disk graphs"
    - "improved approximation algorithms for geometric set cover"

Connected through hyperedge HE-8 (induced by source paper "polylogarithmic approximation algorithms for weighted mathcal f deletion problems"):
  with members:
    - "feedback vertex set inspired kernel for chordal vertex deletion"
    - "approximation and kernelization for chordal vertex deletion"
    - "bidimensionality and kernels"
    - "lp based robust algorithms for noisy minor free and bounded treewidth graphs"
    - "bidimensionality and geometric graphs"
    - "hitting forbidden minors approximation and kernelization"
    - "hitting diamonds and growing cacti"

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)