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 "happiness and the productivity of software engineers"):
  Abstract: Software companies and startups often follow the idea of flourishing happiness among developers. Perks, playground rooms, free breakfast, remote office options, sports facilities near the companies, company retreats, you name it. The rationale is that happy developers should be more productive and also retained. #R##N#But is it the case that happy software engineers are more productive? Moreover, are perks the way to go to make developers happy? Are developers happy at all? What are the consequences of unhappiness among software engineers? #R##N#These questions are important to ask both from the perspective of productivity and from the perspective of sustainable software development and well-being in the workplace. Managers, team leaders, as well as team members should be interested in these concerns. #R##N#This chapter provides an overview of our studies on the happiness of software developers. You will learn why it is important to make software developers happy, how happy they really are, what makes them unhappy, and what is expected regarding happiness and productivity while developing software.

Includes members:
  Member "what happens when software developers are un happy":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "challenges in survey research")
  Member "on the unhappiness of software developers":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "time pressure in software engineering a systematic review")
  Member "how do you feel developer an explanatory theory of the impact of affects on programming performance":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "what happens when software developers are un happy")
  Member "do feelings matter on the correlation of affects and the self assessed productivity in software engineering":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "what happens when software developers are un happy")
  Member "software developers moods emotions and performance":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "measurement of interpersonal trust in global software development slr protocol")
  Member "happy software developers solve problems better psychological measurements in empirical software engineering":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "measurement of interpersonal trust in global software development slr protocol")

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)