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: "publish or impoverish an investigation of the monetary reward system of science in china 1999 2016"
  Abstract: Purpose: The purpose of this study is to present the landscape of the cash-per-publication reward policy in China and reveal its trend since the late 1990s. #R##N#Design/methodology/approach: This study is based on the analysis of 168 university documents regarding the cash-per-publication reward policy at 100 Chinese universities. #R##N#Findings: Chinese universities offer cash rewards from 30 to 165,000 USD for papers published in journals indexed by Web of Science (WoS), and the average reward amount has been increasing for the past 10 years. #R##N#Originality/value: The cash-per-publication reward policy in China has never been systematically studied and investigated before except for in some case studies. This is the first paper that reveals the landscape of the cash-per-publication reward policy in China.

Connected through hyperedge HE-1 (induced by source paper "a tale of two databases the use of web of science and scopus in academic papers"):
  with members:
    - "funding information in web of science an updated overview"
    - "google scholar web of science and scopus a systematic comparison of citations in 252 subject categories"
    - "missing author address information in web of science an explorative study"
    - "trends in russian research output indexed in scopus and web of science"
    - "book reviews in academic journals patterns and dynamics"
    - "the journal coverage of web of science and scopus a comparative analysis"
    - "large scale analysis of the accuracy of the journal classification systems of web of science and scopus"
    - "global maps of science based on the new web of science categories"

Connected through hyperedge HE-2 (induced by source paper "does monetary support increase citation impact of scholarly papers"):
  with members:
    - "when research assessment exercises leave room for opportunistic behavior by the subjects under evaluation"
    - "over optimization of academic publishing metrics observing goodhart s law in action"

Connected through hyperedge HE-3 (induced by source paper "the role of web of science publications in china s tenure system"):
  with members:
    - "the journal impact factor a brief history critique and discussion of adverse effects"
    - "the weakening relationship between the impact factor and papers citations in the digital age"

Connected through hyperedge HE-4 (induced by source paper "does the web of science accurately represent chinese scientific performance"):
  with members:
    - "the normalization of co authorship networks in the bibliometric evaluation the government stimulation programs of china and korea"
    - "international scientific collaboration of china collaborating countries institutions and individuals"
    - "a comparison between the china scientific and technical papers and citations database and the science citation index in terms of journal hierarchies and inter journal citation relations"

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.DL(Digital Libraries)