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 "e prints and journal articles in astronomy a productive co existence"):
  Abstract: Are the e-prints (electronic preprints) from the arXiv repository being used instead of journal articles? We show that the e-prints have not undermined the usage of journal papers from the four core journals in astrophysics. As soon as the journal article is published, the astronomical community prefers to read it and the use of e-prints through the NASA Astrophysics Data System drops to zero. This suggests that most astronomers have access to institutional subscriptions and that they choose to read the journal article. In other words, the e-prints have not undermined journal use in this community and thus currently do not pose a financial threat to publishers. Furthermore, we show that the half-life (the point at which the use of an article drops to half the use of a newly published article) for an e-print is shorter than for a journal paper.

Includes members:
  Member "effect of e printing on citation rates in astronomy and physics":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "core elements in the process of citing publications conceptual overview of the literature")
  Member "myads arxiv a tailor made open access virtual journal":
    also connected through other hyperedges:
      (none)
  Member "the bibliometric properties of article readership information":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "readership data and research impact")
  Member "the effect of use and access on citations":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "publication modalities article in press and open access in relation to journal average citation")

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.DL(Digital Libraries)