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: "beyond bidimensionality parameterized subexponential algorithms on directed graphs"
  Abstract: We develop two different methods to achieve subexponential time parameterized algorithms for problems on sparse directed graphs. We exemplify our approaches with two well studied problems. #R##N#For the first problem, {\sc $k$-Leaf Out-Branching}, which is to find an oriented spanning tree with at least $k$ leaves, we obtain an algorithm solving the problem in time $2^{O(\sqrt{k} \log k)} n+ n^{O(1)}$ on directed graphs whose underlying undirected graph excludes some fixed graph $H$ as a minor. For the special case when the input directed graph is planar, the running time can be improved to $2^{O(\sqrt{k})}n + n^{O(1)}$. The second example is a generalization of the {\sc Directed Hamiltonian Path} problem, namely {\sc $k$-Internal Out-Branching}, which is to find an oriented spanning tree with at least $k$ internal vertices. We obtain an algorithm solving the problem in time $2^{O(\sqrt{k} \log k)} + n^{O(1)}$ on directed graphs whose underlying undirected graph excludes some fixed apex graph $H$ as a minor. Finally, we observe that for any $\epsilon>0$, the {\sc $k$-Directed Path} problem is solvable in time $O((1+\epsilon)^k n^{f(\epsilon)})$, where $f$ is some function of $\ve$. #R##N#Our methods are based on non-trivial combinations of obstruction theorems for undirected graphs, kernelization, problem specific combinatorial structures and a layering technique similar to the one employed by Baker to obtain PTAS for planar graphs.

Connected through hyperedge HE-1 (induced by source paper "detecting and counting small patterns in planar graphs in subexponential parameterized time"):
  with members:
    - "homomorphisms are a good basis for counting small subgraphs"
    - "computing the number of induced copies of a fixed graph in a bounded degree graph"
    - "subexponential parameterized algorithms for planar and apex minor free graphs via low treewidth pattern covering"
    - "counting matchings with k unmatched vertices in planar graphs"
    - "approximating the partition function of planar two state spin systems"
    - "on triangulating k outerplanar graphs"
    - "approximate counting via correlation decay on planar graphs"
    - "planar subgraph isomorphism revisited"

Connected through hyperedge HE-2 (induced by source paper "subexponential parameterized algorithms for planar and apex minor free graphs via low treewidth pattern covering"):
  with members:
    - "network sparsification for steiner problems on planar and bounded genus graphs"
    - "bidimensionality and geometric graphs"
    - "planar subgraph isomorphism revisited"
    - "subgraph isomorphism in planar graphs and related problems"

Connected through hyperedge HE-3 (induced by source paper "subexponential parameterized algorithms for graphs of polynomial growth"):
  with members:
    - "subexponential parameterized algorithms for planar and apex minor free graphs via low treewidth pattern covering"
    - "the limited blessing of low dimensionality when 1 1 d is the best possible exponent for d dimensional geometric problems"
    - "partition merge distributed inference and modularity optimization"

Connected through hyperedge HE-4 (induced by source paper "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"):
  with members:
    - "the limited blessing of low dimensionality when 1 1 d is the best possible exponent for d dimensional geometric problems"
    - "qptas for geometric set cover problems via optimal separators"
    - "quasi polynomial time approximation scheme for sparse subsets of polygons"
    - "a qptas for maximum weight independent set of polygons with polylogarithmically many vertices"
    - "network sparsification for steiner problems on planar and bounded genus graphs"
    - "approximation schemes for maximum weight independent set of rectangles"
    - "kernelization of packing problems"
    - "k gap interval graphs"

Connected through hyperedge HE-5 (induced by source paper "linear kernels for outbranching problems in sparse digraphs"):
  with members:
    - "bidimensionality and kernels"
    - "kernelization and sparseness the case of dominating set"
    - "kernelization using structural parameters on sparse graph classes"
    - "network sparsification for steiner problems on planar and bounded genus graphs"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "problems parameterized by treewidth tractable in single exponential time a logical approach"
    - "on finding directed trees with many leaves"
    - "on complexity of minimum leaf out branching problem"

Connected through hyperedge HE-6 (induced by source paper "kernels for connected dominating set on graphs with excluded topological subgraphs"):
  with members:
    - "tight kernel bounds for problems on graphs with small degeneracy"
    - "linear kernels and single exponential algorithms via protrusion decompositions"
    - "parameterized complexity of directed steiner tree on sparse graphs"
    - "structure theorem and isomorphism test for graphs with excluded topological subgraphs"
    - "bidimensionality and geometric graphs"
    - "hitting forbidden minors approximation and kernelization"
    - "bidimensionality and eptas"
    - "solving dominating set in larger classes of graphs fpt algorithms and polynomial kernels"

Connected through hyperedge HE-7 (induced by source paper "confronting intractability via parameters"):
  with members:
    - "slightly superexponential parameterized problems"
    - "bidimensionality and kernels"
    - "how good is the chord algorithm"
    - "minimizing movement fixed parameter tractability"
    - "dynamic programming for graphs on surfaces"
    - "courcelle s theorem a game theoretic approach"
    - "preprocessing for treewidth a combinatorial analysis through kernelization"
    - "solving connectivity problems parameterized by treewidth in single exponential time"

Connected through hyperedge HE-8 (induced by source paper "faster approximation schemes and parameterized algorithms on h minor free and odd minor free graphs"):
  with members:
    - "deciding first order properties of locally tree decomposable structures"

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)