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: "an empirical study on leanness and flexibility in distributed software development"
  Abstract: Nowadays, many individuals and teams involved on projects are already using agile development techniques as part of their daily work. However, we have much less experience in how to scale and manage agile practices in distributed software development. Distributed and global development- that requiring attention to many technical, organizational, and cultural issues as the teams interact to cooperatively delivery the solution. Alongside, very large team sizes, teams of teams, and more complex management structures forcing additional attention to coordination and management. At this level, there is an increasing need to standardize best practices to avoid reinvention and miscommunication across artifacts and processes. Complexity issues in enterprise software delivery can have significant impact on the adoption of agile approaches. As a consequence, agile strategies will typically need to be evaluated, tailored, and perhaps combined with traditional approaches to suit the particular context. The characteristics of software products and software development processes open up new possibilities that are different from those offered in other domains to achieve leanness and flexibility. Whilst Lean principles are universal, a further understanding of the techniques required to apply such principles from a software development angle. Thus, the aim of this research is to identify, how leanness facilitate flexibility in distributed software development to speed-up development process.

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)