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: "towards a formalization of the unified modeling language"
  Abstract: The Unified Modeling Language UML is a language for specifying, visualizing and documenting object-oriented systems. UML combines the concepts of OOA/OOD, OMT and OOSE and is intended as a standard in the domain of object-oriented analysis and design. Due to the missing formal, mathematical foundation of UML the syntax and the semantics of a number of UML constructs are not precisely defined. This paper outlines a proposal for the formal foundation of UML that is based on a mathematical system model.

Connected through hyperedge HE-1 (induced by source paper "new opportunities for integrated formal methods"):
  with members:
    - "model based system assurance using the structured assurance case metamodel"
    - "formal specification and verification of autonomous robotic systems a survey"
    - "fifty years of software engineering or the view from garmisch"
    - "safety practice and its practitioners exploring a diverse profession"
    - "formal methods oversold underused a survey"
    - "robotics and integrated formal methods necessity meets opportunity"
    - "report on the nsf workshop on formal methods for security"
    - "introduction of static quality analysis in small and medium sized software enterprises experiences from technology transfer"

Connected through hyperedge HE-2 (induced by source paper "a note on semantics with an emphasis on uml"):
  with members:
    - "the uml as a formal modeling notation"
    - "a stream based mathematical model for distributed information processing systems the syslab system model"
    - "automata describing object behavior"

Connected through hyperedge HE-3 (induced by source paper "state based service description"):
  with members:
    - "a stream based mathematical model for distributed information processing systems the syslab system model"
    - "automata describing object behavior"

Connected through hyperedge HE-4 (induced by source paper "developing the uml as a formal modelling notation"):
  with members:
    - "a stream based mathematical model for distributed information processing systems the syslab system model"

Connected through hyperedge HE-5 (induced by source paper "confluent drawings visualizing non planar diagrams in a planar way"):
  with members:
    - "confluent layered drawings"

Connected through hyperedge HE-6 (induced by source paper "meta modelling semantics of uml"):
  with members:
    - "developing the uml as a formal modelling notation"

Connected through hyperedge HE-7 (induced by source paper "defining uml family members using prefaces"):
  with members:
    - "developing the uml as a formal modelling notation"

Connected through hyperedge HE-8 (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"
    - "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"

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)