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: "book reviews in academic journals patterns and dynamics"
  Abstract: Book reviews play important roles in scholarly communication especially in arts and humanities disciplines. By using Web of Science's Science Citation Index Expanded, Social Sciences Citation Index, and Arts & Humanities Citation Index, this study probed the patterns and dynamics of book reviews within these three indexes empirically during the past decade (2006---2015). We found that the absolute numbers of book reviews among all the three indexes were relatively stable but the relative shares were decreasing. Book reviews were very common in arts and humanities, common in social sciences, but rare in natural sciences. Book reviews are mainly contributed by authors from developed economies such as the USA and the UK. Oppositely, scholars from China and Japan are unlikely to contribute to book reviews.

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"
    - "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 "missing author address information in web of science an explorative study"):
  with members:
    - "funding acknowledgment analysis queries and caveats"
    - "a spatial scientometric analysis of the publication output of cities worldwide"
    - "constructing bibliometric networks a comparison between full and fractional counting"
    - "a new methodology for constructing a publication level classification system of science"
    - "globalisation of science in kilometres"

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)