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: "a stream based mathematical model for distributed information processing systems the syslab system model"
  Abstract: In the SysLab-project, we develop a software engineering method based on a thorough mathematical foundation. The SysLab system model serves as an abstract mathematical model for information systems and their components. It is used to formalize the semantics of all used description techniques, such as object diagrams, state automata, sequence charts or data-flow diagrams. The system model hence is the key to the semantic integration of the method. Based on the requirements for such a reference model, we define the system model including its different views and their relationships.

Connected through hyperedge HE-1 (induced by source paper "modular description of a comprehensive semantics model for the uml version 2 0"):
  with members:
    - "systems views and models of uml"
    - "system model based simulation of uml models"
    - "an algebraic view on the semantics of model composition"
    - "enhancing the syslab system model with state"
    - "meta modelling semantics of uml"

Connected through hyperedge HE-2 (induced by source paper "systems views and models of uml"):
  with members:
    - "concurrent timed port automata"
    - "state based service description"
    - "enhancing the syslab system model with state"
    - "towards a precise semantics for object oriented modeling techniques"

Connected through hyperedge HE-3 (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"
    - "automata describing object behavior"

Connected through hyperedge HE-4 (induced by source paper "state based service description"):
  with members:
    - "towards a formalization of the unified modeling language"
    - "automata describing object behavior"

Connected through hyperedge HE-5 (induced by source paper "towards a system model for uml the structural data model"):
  with members:
    - "concurrent timed port automata"

Connected through hyperedge HE-6 (induced by source paper "developing the uml as a formal modelling notation"):
  with members:
    - "towards a formalization of the unified modeling language"

Connected through hyperedge HE-7 (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"
    - "refinement of information flow architectures"
    - "towards a precise semantics for object oriented modeling techniques"
    - "automata describing object behavior"

Connected through hyperedge HE-8 (induced by source paper "towards a formalization of the unified modeling language"):
  with members:
    - "state based service description"
    - "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)