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 formal model of the safety critical java level 2 paradigm"
  Abstract: Safety-Critical Java SCJ introduces a new programming paradigm for applications that must be certified. The SCJ specificationi?źJSR 302 is an Open Group Standard, but it does not include verification techniques. Previous work has addressed verification for SCJ Leveli?ź1 programs. We support the much more complex SCJ Leveli?ź2 programs, which allows the programming of highly concurrent multi-processor applications with Java threads, and wait and notify mechanisms. We present a formal model of SCJ Leveli?ź2 that captures the state and behaviour of both SCJ programs and the SCJ API. This is the first formal semantics of the SCJ Leveli?ź2 paradigm and is an essential ingredient in the development of refinement-based reasoning techniques for SCJ Leveli?ź2 programs. We show how our models can be used to prove properties of the SCJ API and applications.

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)