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: "introducing citedreferencesexplorer crexplorer a program for reference publication year spectroscopy with cited references standardization"
  Abstract: We introduce a new tool - the CitedReferencesExplorer (CRExplorer, www.crexplorer.net) - which can be used to disambiguate and analyze the cited references (CRs) of a publication set downloaded from the Web of Science (WoS). The tool is especially suitable to identify those publications which have been frequently cited by the researchers in a field and thereby to study for example the historical roots of a research field or topic. CRExplorer simplifies the identification of key publications by enabling the user to work with both a graph for identifying most frequently cited reference publication years (RPYs) and the list of references for the RPYs which have been most frequently cited. A further focus of the program is on the standardization of CRs. It is a serious problem in bibliometrics that there are several variants of the same CR in the WoS. In this study, CRExplorer is used to study the CRs of all papers published in the Journal of Informetrics. The analyses focus on the most important papers published between 1980 and 1990.

Connected through hyperedge HE-1 (induced by source paper "how to identify the roots of broad research topics and fields the introduction of rpys sampling using the example of climate change research"):
  with members:
    - "climate change research in view of bibliometrics"
    - "growth rates of modern science a bibliometric analysis based on the number of publications and cited references"
    - "detecting the historical roots of research fields by reference publication year spectroscopy rpys"
    - "referenced publication years spectroscopy applied to imetrics scientometrics journal of informetrics and a relevant subset of jasist"

Connected through hyperedge HE-2 (induced by source paper "identifying single influential publications in a research field new analysis opportunities of the crexplorer"):
  with members:
    - "climate change research in view of bibliometrics"
    - "smart girls versus sleeping beauties in the sciences the identification of instant and delayed recognition by using the citation angle"
    - "new features of citedreferencesexplorer crexplorer"
    - "citation score normalized by cited references csncr the introduction of a new citation impact indicator"
    - "detecting the historical roots of tribology research a bibliometric analysis"
    - "a review of the literature on citation impact indicators"
    - "growth rates of modern science a bibliometric analysis based on the number of publications and cited references"
    - "citnetexplorer a new software tool for analyzing and visualizing citation networks"

Connected through hyperedge HE-3 (induced by source paper "opium in science and society numbers"):
  with members:
    - "core elements in the process of citing publications conceptual overview of the literature"
    - "a review of the characteristics of 108 author level bibliometric indicators"
    - "which of the world s institutions employ the most highly cited researchers an analysis of the data from highlycited com"
    - "measuring impact in research evaluations a thorough discussion of methods for effects of and problems with impact measurements"
    - "on the causes of subject specific citation rates in web of science"
    - "research misconduct definitions manifestations and extent"
    - "severe language effect in university rankings particularly germany and france are wronged in citation based rankings"

Connected through hyperedge HE-4 (induced by source paper "intermediacy of publications"):
  with members:
    - "accuracy of citation data in web of science and scopus"
    - "which type of citation analysis generates the most accurate taxonomy of scientific and technical knowledge"
    - "tracing technological development trajectories a genetic knowledge persistence based main path approach"
    - "citnetexplorer a new software tool for analyzing and visualizing citation networks"
    - "detecting the historical roots of research fields by reference publication year spectroscopy rpys"
    - "a new methodology for constructing a publication level classification system of science"
    - "efficient algorithms for citation network analysis"

Connected through hyperedge HE-5 (induced by source paper "data mining the foundational patents of photovoltaic materials an application of patent citation spectroscopy"):
  with members:
    - "strategic intelligence on emerging technologies scientometric overlay mapping"
    - "patent citation spectroscopy pcs algorithmic retrieval of landmark patents"
    - "citation algorithms for identifying research milestones driving biomedical innovation"
    - "patents as instruments for exploring innovation dynamics geographic and technological perspectives on photovoltaic cells"
    - "detecting the historical roots of research fields by reference publication year spectroscopy rpys"
    - "publish or patent bibliometric evidence for empirical trade offs in national funding strategies"

Connected through hyperedge HE-6 (induced by source paper "the geography of references in elite articles which countries contribute to the archives of knowledge"):
  with members:
    - "citation algorithms for identifying research milestones driving biomedical innovation"
    - "citations indicators of quality the impact fallacy"
    - "excellence networks in science a web based application based on bayesian multilevel logistic regression bmlr for the identification of institutions collaborating successfully"
    - "the european union china and the united states in the top 1 and top 10 layers of most frequently cited publications competition and collaborations"
    - "a bird s eye view of scientific trading dependency relations among fields of science"

Connected through hyperedge HE-7 (induced by source paper "reference publication year spectroscopy rpys of eugene garfield s publications"):
  with members:
    - "new features of citedreferencesexplorer crexplorer"
    - "citnetexplorer a new software tool for analyzing and visualizing citation networks"
    - "detecting the historical roots of research fields by reference publication year spectroscopy rpys"
    - "eugene garfield and algorithmic historiography co words co authors and journal names"

Connected through hyperedge HE-8 (induced by source paper "citations indicators of quality the impact fallacy"):
  with members:
    - "identification of long term concept symbols among citations can documents be clustered in terms of common intellectual histories"
    - "interpreting altmetrics viewing acts on social media through the lens of citation and social theories"
    - "quantifying the cognitive extent of science"
    - "the operationalization of fields as wos subject categories wcs in evaluative bibliometrics the cases of library and information science and science technology studies"
    - "the role of handbooks in knowledge creation and diffusion a case of science and technology studies"
    - "citnetexplorer a new software tool for analyzing and visualizing citation networks"
    - "detecting the historical roots of research fields by reference publication year spectroscopy rpys"
    - "referenced publication years spectroscopy applied to imetrics scientometrics journal of informetrics and a relevant subset of jasist"

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)