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: "verifas a practical verifier for artifact systems"
  Abstract: Data-driven workflows, of which IBM's Business Artifacts are a prime exponent, have been successfully deployed in practice, adopted in industrial standards, and have spawned a rich body of research in academia, focused primarily on static analysis. The present research bridges the gap between the theory and practice of artifact verification with the implementation of VERIFAS, a full-fledged and efficient artifact verifier for verifying LTL-FO properties of workflows specified in a variant of the Hierarchical Artifact System (HAS) model presented in [16]. Compared to a nontrivial Spin-based verifier implemented in our previous work [29], VERIFAS applies to a much broader class of artifacts. In addition, as shown in our experimental results on both real and synthetic workflows, our verifier has a decisive performance advantage even on the simple artifacts that the Spin-based verifier is able to handle. The significantly improved performance is due to a novel symbolic representation approach and a family of specialized optimizations to the classic Karp-Miller algorithm.

Connected through hyperedge HE-1 (induced by source paper "formal modeling and smt based parameterized verification of data aware bpmn extended version"):
  with members:
    - "formal modeling and smt based parameterized verification of multi case data aware bpmn"
    - "formal modeling and smt based parameterized verification of data aware bpmn"
    - "db nets on the marriage of colored petri nets and relational databases"
    - "verification of hierarchical artifact systems"
    - "monotonic abstraction techniques from parametric to software model checking"
    - "backward reachability of array based systems by smt solving termination and invariant synthesis"

Connected through hyperedge HE-2 (induced by source paper "formal modeling and smt based parameterized verification of data aware bpmn"):
  with members:
    - "formal modeling and smt based parameterized verification of data aware bpmn extended version"
    - "formal modeling and smt based parameterized verification of multi case data aware bpmn"
    - "db nets on the marriage of colored petri nets and relational databases"
    - "verification of hierarchical artifact systems"
    - "interactive learning based realizability for heyting arithmetic with em1"
    - "backward reachability of array based systems by smt solving termination and invariant synthesis"

Connected through hyperedge HE-3 (induced by source paper "the reachability problem for petri nets is not elementary"):
  with members:
    - "reachability in vector addition systems is primitive recursive in fixed dimension"
    - "linear equations with ordered data"
    - "reasoning about data repetitions with counter systems"
    - "complexity hierarchies beyond elementary"
    - "reachability in two dimensional unary vector addition systems with states is nl complete"
    - "demystifying reachability in vector addition systems"
    - "nonelementary complexities for branching vass mell and extensions"
    - "reachability in two dimensional vector addition systems with states is pspace complete"

Connected through hyperedge HE-4 (induced by source paper "modeling and in database management of relational data aware processes extended version"):
  with members:
    - "db nets on the marriage of colored petri nets and relational databases"
    - "verification of artifact centric systems decidability and modeling issues"
    - "verification of relational data centric dynamic systems with external services"

Connected through hyperedge HE-5 (induced by source paper "verification of hierarchical artifact systems"):
  with members:
    - "verification of artifact centric systems decidability and modeling issues"
    - "verification of agent based artifact systems"
    - "verification of relational data centric dynamic systems with external services"

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.DB(Databases)