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 the queue number of graphs with bounded tree width"
  Abstract: A queue layout of a graph consists of a linear order on the vertices and an assignment of the edges to queues, such that no two edges in a single queue are nested. The minimum number of queues needed in a queue layout of a graph is called its queue-number. #R##N#We show that for each $k\geq1$, graphs with tree-width at most $k$ have queue-number at most $2^k-1$. This improves upon double exponential upper bounds due to Dujmovi\'c et al. and Giacomo et al. As a consequence we obtain that these graphs have track-number at most $2^{O(k^2)}$. #R##N#We complement these results by a construction of $k$-trees that have queue-number at least $k+1$. Already in the case $k=2$ this is an improvement to existing results and solves a problem of Rengarajan and Veni Madhavan, namely, that the maximal queue-number of $2$-trees is equal to $3$.

Connected through hyperedge HE-1 (induced by source paper "planar graphs have bounded queue number"):
  with members:
    - "shorter labeling schemes for planar graphs"
    - "planar graphs of bounded degree have constant queue number"
    - "polynomial bounds for centered colorings on proper minor closed graph classes"
    - "queue layouts of planar 3 trees"
    - "layouts for plane graphs on constant number of tracks"
    - "an annotated bibliography on 1 planarity"
    - "stack and queue layouts via layered separators"
    - "list coloring apex minor free graphs"

Connected through hyperedge HE-2 (induced by source paper "improved bounds for track numbers of planar graphs"):
  with members:
    - "planar graphs have bounded queue number"
    - "queue layouts of planar 3 trees"
    - "layout of graphs with bounded tree width"

Connected through hyperedge HE-3 (induced by source paper "planar graphs of bounded degree have constant queue number"):
  with members:
    - "planar graphs have bounded queue number"
    - "queue layouts of planar 3 trees"
    - "mixed linear layouts of planar graphs"
    - "stack and queue layouts via layered separators"
    - "graph layouts via layered separators"
    - "layout of graphs with bounded tree width"

Connected through hyperedge HE-4 (induced by source paper "queue layouts of planar 3 trees"):
  with members:
    - "mixed linear layouts of planar graphs"
    - "stack and queue layouts via layered separators"
    - "graph layouts via layered separators"
    - "layout of graphs with bounded tree width"

Connected through hyperedge HE-5 (induced by source paper "mixed linear layouts of planar graphs"):
  with members:
    - "graph layouts via layered separators"

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.DM(Discrete Mathematics)