human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "formality in software requirements"):
  Abstract: A major determinant of the quality of software systems is the quality of their requirements, which should be both understandable and precise. Natural language, the most commonly used for writing requirements, helps understandability, but lacks precision. #R##N#To achieve precision, researchers have for many years advocated the use of "formal" approaches to writing requirements. These efforts have produced many requirements methods and notations, which vary considerably in their style, scope and applicability. The present survey discusses some of the principal approaches. #R##N#The analysis uses a number of complementary criteria, such as traceability support, level of abstraction and tool support. It classifies the surveyed techniques into five categories: general-purpose, natural-language-based, graph and automata, other mathematical notations, and programming-language-based). The review includes examples from all of these categories, altogether 22 different methods, including for example SysML, Relax, Petri Nets, VDM, Eiffel, Event-B, Alloy. #R##N#The review discusses a number of important open questions, including the role of tools and education and how to make industrial applications benefit more from the contributions of formal approaches.

Includes members:
  Member "autoreq expressing and verifying requirements for control systems":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "seamless object oriented requirements")
  Member "a contract based method to specify stimulus response requirements":
    also connected through other hyperedges:
      (none)
  Member "complete contracts through specification drivers":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "seamless object oriented requirements")
  Member "unifying requirements and code an example":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "object oriented requirements reusable understandable verifiable")
  Member "reasoning about identifier spaces how to make chord correct":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "a study of the learnability of relational properties model counting meets machine learning")
  Member "autoproof auto active functional verification of object oriented programs":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "seamless object oriented requirements")

Question: Please tell me which class the source paper 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)