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: "missing author address information in web of science an explorative study"
  Abstract: Abstract   Bibliometric analysis is increasingly used to evaluate and compare research performance across geographical regions. However, the problem of missing information from author addresses has not attracted sufficient attention from scholars and practitioners. This study probes the missing data problem in the three core journal citation databases of Web of Science (WoS). Our findings reveal that from 1900 to 2015 over one-fifth of the publications indexed in WoS have completely missing information from the address field. The magnitude of the problem varies greatly among time periods, citation databases, document types, and publishing languages. The problem is especially serious for research in the sciences and social sciences published before the early 1970s and remains significant for recent publications in the arts and humanities. Further examinations suggest that many records with completely missing address information do not represent scholarly research. Full-text scanning of a random sample reveals that about 40% of the missing address articles have some address information that is not indexed in WoS. This study also finds that the problem of partially missing address information for U.S. research has diminished dramatically since 1998. The paper ends by providing some discussion and tentative remedies.

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"
    - "trends in russian research output indexed in scopus and web of science"
    - "book reviews in academic journals patterns and dynamics"
    - "publish or impoverish an investigation of the monetary reward system of science in china 1999 2016"
    - "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 "funding information in web of science an updated overview"):
  with members:
    - "solving multiple criteria r d project selection problems with a data driven evidential reasoning rule"
    - "funding acknowledgment analysis queries and caveats"
    - "the sum of it all revealing collaboration patterns by combining authorship and acknowledgements"
    - "characterization description and considerations for the use of funding acknowledgement data in web of science"
    - "the journal coverage of web of science and scopus a comparative analysis"

Connected through hyperedge HE-3 (induced by source paper "long live the scientists tracking the scientific fame of great minds in physics"):
  with members:
    - "a review of the literature on citation impact indicators"
    - "do altmetrics correlate with citations extensive comparison of altmetric indicators with citations from a multidisciplinary perspective"
    - "do altmetrics point to the broader impact of research an overview of benefits and disadvantages of altmetrics"
    - "quantifying long term scientific impact"

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)