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: "state based service description"
  Abstract: In this paper we propose I/O state transition diagrams for service description In contrast to other techniques like for example Statecharts we allow to model non atomic services by sequences of transitions This is especially important in a distributed system where concurrent service invocation cannot be prohibited We give a mathematical model of object behaviour based on concurrent and sequential messages Then we give a precise semantics of the service descriptions in terms of the mathematical model.

Connected through hyperedge HE-1 (induced by source paper "systems views and models of uml"):
  with members:
    - "concurrent timed port automata"
    - "enhancing the syslab system model with state"
    - "a stream based mathematical model for distributed information processing systems the syslab system model"
    - "towards a precise semantics for object oriented modeling techniques"

Connected through hyperedge HE-2 (induced by source paper "software and system modeling based on a unified formal semantics"):
  with members:
    - "exemplary and complete object interaction descriptions"
    - "enhancing the syslab system model with state"
    - "towards a formalization of the unified modeling language"
    - "a stream based mathematical model for distributed information processing systems the syslab system model"
    - "refinement of information flow architectures"
    - "towards a precise semantics for object oriented modeling techniques"
    - "automata describing object behavior"

Connected through hyperedge HE-3 (induced by source paper "towards a formalization of the unified modeling language"):
  with members:
    - "a stream based mathematical model for distributed information processing systems the syslab system model"
    - "automata describing object behavior"

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.SE(Software Engineering)