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: "ranking research institutions by the number of highly cited articles per scientist"
  Abstract: In the literature and on the Web we can readily find research excellence rankings for organizations and countries by either total number of highly-cited articles (HCAs) or by ratio of HCAs to total publications. Neither are indicators of efficiency. In the current work we propose an indicator of efficiency, the number of HCAs per scientist, which can complement the productivity indicators based on impact of total output. We apply this indicator to measure excellence in the research of Italian universities as a whole, and in each field and discipline of the hard sciences.

Connected through hyperedge HE-1 (induced by source paper "comparison of research productivity of italian and norwegian professors and universities"):
  with members:
    - "predicting publication long term impact through a combination of early citations and journal impact factor"
    - "the impact of unproductive and top researchers on overall university research performance"
    - "the elephant in the room the problem of quantifying productivity in evaluative scientometrics"
    - "the ratio of top scientists to the academic staff as an indicator of the competitive strength of universities"
    - "not dead just resting the practical value of per publication citation indicators"
    - "efficiency of research performance and the glass researcher"
    - "predicting the long term citation impact of recent publications"
    - "how do you define and measure research productivity"

Connected through hyperedge HE-2 (induced by source paper "field normalization of scientometric indicators"):
  with members:
    - "relative citation ratio rcr an empirical attempt to study a new field normalized bibliometric indicator"
    - "citation analysis with microsoft academic"
    - "three practical field normalised alternative indicator formulae for research evaluation"
    - "a comparison of university performance scores and ranks by mncs and fss"
    - "a farewell to the mncs and like size independent indicators"
    - "citation score normalized by cited references csncr the introduction of a new citation impact indicator"
    - "national disciplinary and temporal variations in the extent to which articles with more authors have more impact evidence from a geometric field normalised citation indicator"
    - "quality versus quantity in scientific impact"

Connected through hyperedge HE-3 (induced by source paper "mendeley readership as a filtering tool to identify highly cited publications"):
  with members:
    - "do mendeley readership counts help to filter highly cited wos publications better than average citation impact of journals jcs"
    - "geometric journal impact factors correcting for individual highly cited articles"
    - "networks of reader and country status an analysis of mendeley reader statistics"
    - "tweets vs mendeley readers how do these two social media metrics differ"
    - "how are excellent highly cited papers defined in bibliometrics a quantitative analysis of the literature"
    - "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"
    - "tweeting biomedicine an analysis of tweets and citations in the biomedical literature"

Connected through hyperedge HE-4 (induced by source paper "a comparison of university performance scores and ranks by mncs and fss"):
  with members:
    - "testing the trade off between productivity and quality in research activities"
    - "a farewell to the mncs and like size independent indicators"
    - "efficiency of research performance and the glass researcher"
    - "evaluating university research same performance indicator different rankings"
    - "does quantity make a difference the importance of publishing many papers"
    - "how do you define and measure research productivity"
    - "measuring institutional research productivity for the life sciences the importance of accounting for the order of authors in the byline"
    - "assessing the accuracy of the h and g indexes for measuring researchers productivity"

Connected through hyperedge HE-5 (induced by source paper "the ratio of top scientists to the academic staff as an indicator of the competitive strength of universities"):
  with members:
    - "measuring science irresistible temptations easy shortcuts and dangerous consequences"
    - "the impact of unproductive and top researchers on overall university research performance"
    - "from rankings to funnel plots the question of accounting for uncertainty when assessing university research performance"
    - "the determinants of academic career advancement evidence from italy"
    - "which of the world s institutions employ the most highly cited researchers an analysis of the data from highlycited com"
    - "how do you define and measure research productivity"
    - "variability of research performance across disciplines within universities in non competitive higher education systems"
    - "career advancement and scientific performance in universities"

Connected through hyperedge HE-6 (induced by source paper "a farewell to the mncs and like size independent indicators"):
  with members:
    - "more precise methods for national research citation impact comparisons"
    - "how do you define and measure research productivity"
    - "assessing the accuracy of the h and g indexes for measuring researchers productivity"
    - "national scale research performance assessment at the individual level"
    - "cwts crown indicator measures citation impact of a research group s publication oeuvre"
    - "towards a new crown indicator some theoretical considerations"
    - "caveats for the journal and field normalizations in the cwts leiden evaluations of research performance"
    - "remaining problems with the new crown indicator mncs of the cwts"

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)