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: "automata describing object behavior"
  Abstract: Relating formal refinement techniques with commercial object-oriented software development methods is important to achieve enhancement of the power and flexibility of these software development methods- and tools. We will present an automata model together with a denotational and an operational semantics to describe the behavior of objects. Based on the given semantics, we define a set of powerful refinement rules, and discuss their applicability in software engineering practice, especially with the use of inheritance.

Connected through hyperedge HE-1 (induced by source paper "a note on semantics with an emphasis on uml"):
  with members:
    - "the uml as a formal modeling notation"
    - "towards a formalization of the unified modeling language"
    - "a stream based mathematical model for distributed information processing systems the syslab system model"

Connected through hyperedge HE-2 (induced by source paper "state based service description"):
  with members:
    - "towards a formalization of the unified modeling language"
    - "a stream based mathematical model for distributed information processing systems the syslab system model"

Connected through hyperedge HE-3 (induced by source paper "feature specification and refinement with state transition diagrams"):
  with members:
    - "enhancing the syslab system model with state"

Connected through hyperedge HE-4 (induced by source paper "software and system modeling based on a unified formal semantics"):
  with members:
    - "exemplary and complete object interaction descriptions"
    - "state based service description"
    - "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"

Connected through hyperedge HE-5 (induced by source paper "towards a formalization of the unified modeling language"):
  with members:
    - "state based service description"
    - "a stream based mathematical model for distributed information processing systems the syslab system model"

Connected through hyperedge HE-6 (induced by source paper "towards a precise semantics for object oriented modeling techniques"):
  with members:
    - "a stream based mathematical model for distributed information processing systems the syslab system model"

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)