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: "maintaining acyclicity of concurrent graphs"
  Abstract: In this paper, we consider the problem of preserving acyclicity in a directed graph (for#R##N#shared memory architecture) that is concurrently being updated by threads adding/deleting#R##N#vertices and edges.  To the best of our knowledge, no previous paper has presented a con-#R##N#current graph data structure.  We implement the concurrent directed graph data-structure#R##N#as  a  concurrent  adjacency  list  representation.   We  extend  the  lazy  list  implementation  of#R##N#concurrent linked lists for maintaining concurrent adjacency lists.  There exists a number of#R##N#graph applications which require the acyclic invariant in a directed graph.  One such example#R##N#is Serialization Graph Testing Algorithm used in databases and transactional memory.  We#R##N#present two concurrent algorithms for maintaining acyclicity in a concurrent graph: (i) Based#R##N#on obstruction-free snapshots (ii) Using wait-free reachability.  We compare the performance#R##N#of these algorithms against the coarse-grained locking strategy,  commonly used technique#R##N#for allowing concurrent updates.  We present the speedup obtained by these algorithms over#R##N#sequential execution.  As a future direction, we plan to extend this data structure for other#R##N#progress conditions.

Connected through hyperedge HE-1 (induced by source paper "early scheduling in parallel state machine replication"):
  with members:
    - "optimistic parallel state machine replication"
    - "rethinking state machine replication for parallelism"

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.DC(Distributed, Parallel, and Cluster Computing)