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: "the weakening relationship between the impact factor and papers citations in the digital age"
  Abstract: Historically, papers have been physically bound to the journal in which they were published but in the electronic age papers are available individually, no longer tied to their respective journals. Hence, papers now can be read and cited based on their own merits, independently of the journal's physical availability, reputation, or Impact Factor. We compare the strength of the relationship between journals' Impact Factors and the actual citations received by their respective papers from 1902 to 2009. Throughout most of the 20th century, papers' citation rates were increasingly linked to their respective journals' Impact Factors. However, since 1990, the advent of the digital age, the strength of the relation between Impact Factors and paper citations has been decreasing. This decrease began sooner in physics, a field that was quicker to make the transition into the electronic domain. Furthermore, since 1990, the proportion of highly cited papers coming from highly cited journals has been decreasing, and accordingly, the proportion of highly cited papers not coming from highly cited journals has also been increasing. Should this pattern continue, it might bring an end to the use of the Impact Factor as a way to evaluate the quality of journals, papers and researchers.

Connected through hyperedge HE-1 (induced by source paper "should citations be field normalized in evaluative bibliometrics an empirical analysis based on propensity score matching"):
  with members:
    - "the preeminence of ethnic diversity in scientific collaboration"
    - "the geography of references in elite articles which countries contribute to the archives of knowledge"
    - "field normalization of scientometric indicators"
    - "which type of citation analysis generates the most accurate taxonomy of scientific and technical knowledge"
    - "relative citation ratio rcr an empirical attempt to study a new field normalized bibliometric indicator"
    - "validity of basing authors publication strategy on journal impact factors"
    - "a review of theory and practice in scientometrics"
    - "large scale analysis of the accuracy of the journal classification systems of web of science and scopus"

Connected through hyperedge HE-2 (induced by source paper "inferring the causal effect of journals on citations"):
  with members:
    - "the journal impact factor a brief history critique and discussion of adverse effects"
    - "use of the journal impact factor for assessing individual articles need not be wrong"
    - "predicting the long term citation impact of recent publications"
    - "arxiv e prints and the journal of record an analysis of roles and relationships"
    - "citations versus journal impact factor as proxy of quality could the latter ever be preferable"

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"
    - "publish or impoverish an investigation of the monetary reward system of science in china 1999 2016"

Connected through hyperedge HE-4 (induced by source paper "could scientists use altmetric com scores to predict longer term citation counts"):
  with members:
    - "use of the journal impact factor for assessing individual articles need not be wrong"
    - "the discretised lognormal and hooked power law distributions for complete citation data best options for modelling and regression"
    - "predicting the long term citation impact of recent publications"
    - "tweets vs mendeley readers how do these two social media metrics differ"
    - "usage history of scientific literature nature metrics and metrics of nature publications"
    - "regression for citation data an evaluation of different methods"
    - "do altmetrics correlate with citations extensive comparison of altmetric indicators with citations from a multidisciplinary perspective"
    - "how well developed are altmetrics a cross disciplinary analysis of the presence of alternative metrics in scientific publications"

Connected through hyperedge HE-5 (induced by source paper "the journal impact factor a brief history critique and discussion of adverse effects"):
  with members:
    - "use of the journal impact factor for assessing individual articles need not be wrong"
    - "rise of the rest the growing impact of non elite journals"
    - "a further step forward in measuring journals scientific prestige the sjr2 indicator"
    - "some modifications to the snip journal impact indicator"
    - "measuring contextual citation impact of scientific journals"

Connected through hyperedge HE-6 (induced by source paper "publish or impoverish an investigation of the monetary reward system of science in china 1999 2016"):
  with members:
    - "the journal coverage of web of science and scopus a comparative analysis"

Connected through hyperedge HE-7 (induced by source paper "influencia de la fecha de publicacion online de los articulos cientificos en los indicadores bibliometricos"):
  with members:
    - "impact factor outdated artefact or stepping stone to journal certification"

Connected through hyperedge HE-8 (induced by source paper "skewness of citation impact data and covariates of citation distributions a large scale empirical analysis based on web of science data"):
  with members:
    - "validity of basing authors publication strategy on journal impact factors"
    - "methods for the generation of normalized citation impact scores in bibliometrics which method best reflects the judgements of experts"
    - "the use of percentiles and percentile rank classes in the analysis of bibliometric data opportunities and limits"
    - "the structure of the arts humanities citation index a mapping on the basis of aggregated citations among 1 157 journals"
    - "caveats for the journal and field normalizations in the cwts leiden evaluations of research performance"

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)