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: "testing differences statistically with the leiden ranking"
  Abstract: The Leiden Ranking 2011/2012 provides the Proportion top-10% publications (PP top 10%) as a new indicator. This indicator allows for testing the difference between two ranks for statistical significance.

Connected through hyperedge HE-1 (induced by source paper "the integrated impact indicator i3 revisited a non parametric alternative to the journal impact factor"):
  with members:
    - "discontinuities in citation relations among journals self organized criticality as a model of scientific revolutions and change"
    - "creativity in science and the link to cited references is the creative potential of papers reflected in their cited references"
    - "use of the journal impact factor for assessing individual articles need not be wrong"
    - "can the journal impact factor be used as a criterion for the selection of junior researchers a large scale empirical study based on researcherid data"
    - "citations indicators of quality the impact fallacy"
    - "how are excellent highly cited papers defined in bibliometrics a quantitative analysis of the literature"
    - "the substantive and practical significance of citation impact differences between institutions guidelines for the analysis of percentiles using effect sizes and confidence intervals"
    - "the academic trace of the performance matrix a mathematical synthesis of the h index and the integrated impact indicator i3"

Connected through hyperedge HE-2 (induced by source paper "statistical significance and effect sizes of differences among research universities at the level of nations and worldwide based on the leiden rankings"):
  with members:
    - "conceptual difficulties in the use of statistical inference in citation analysis"
    - "from rankings to funnel plots the question of accounting for uncertainty when assessing university research performance"
    - "the european union china and the united states in the top 1 and top 10 layers of most frequently cited publications competition and collaborations"
    - "caveats for using statistical significance tests in research assessments"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "measuring contextual citation impact of scientific journals"

Connected through hyperedge HE-3 (induced by source paper "the european union china and the united states in the top 1 and top 10 layers of most frequently cited publications competition and collaborations"):
  with members:
    - "how are excellent highly cited papers defined in bibliometrics a quantitative analysis of the literature"
    - "brics countries and scientific excellence a bibliometric analysis of most frequently cited papers"
    - "how have the eastern european countries of the former warsaw pact developed since 1990 a bibliometric study"
    - "caveats for using statistical significance tests in research assessments"
    - "the use of percentiles and percentile rank classes in the analysis of bibliometric data opportunities and limits"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "publish or patent bibliometric evidence for empirical trade offs in national funding strategies"
    - "world shares of publications of the usa eu 27 and china compared and predicted using the new interface of the web of science versus scopus"

Connected through hyperedge HE-4 (induced by source paper "the revised snip indicator of elsevier s scopus"):
  with members:
    - "alternatives to the journal impact factor i3 and the top 10 or top 25 of the most highly cited papers"
    - "a further step forward in measuring journals scientific prestige the sjr2 indicator"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "some modifications to the snip journal impact indicator"
    - "scopus s source normalized impact per paper snip versus a journal impact factor based on fractional counting of citations"
    - "the danger of pseudo science in informetrics"
    - "caveats for the journal and field normalizations in the cwts leiden evaluations of research performance"
    - "measuring contextual citation impact of scientific journals"

Connected through hyperedge HE-5 (induced by source paper "field normalized impact factors a comparison of rescaling versus fractionally counted ifs"):
  with members:
    - "the weakening relationship between the impact factor and papers citations in the digital age"
    - "alternatives to the journal impact factor i3 and the top 10 or top 25 of the most highly cited papers"
    - "impact factor outdated artefact or stepping stone to journal certification"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "edited volumes monographs and book chapters in the book citation index bkci and science citation index sci sosci a hci"
    - "how can journal impact factors be normalized across fields of science an assessment in terms of percentile ranks and fractional counts"
    - "fractional counting of citations in research evaluation a cross and interdisciplinary assessment of the tsinghua university in beijing"
    - "universality of citation distributions revisited"

Connected through hyperedge HE-6 (induced by source paper "alternatives to the journal impact factor i3 and the top 10 or top 25 of the most highly cited papers"):
  with members:
    - "impact factor outdated artefact or stepping stone to journal certification"
    - "simple arithmetic versus intuitive understanding the case of the impact factor"
    - "a rejoinder on energy versus impact indicators"
    - "fractional counting of citations in research evaluation a cross and interdisciplinary assessment of the tsinghua university in beijing"
    - "betweenness centrality as a driver of preferential attachment in the evolution of research collaboration networks"
    - "which cities produce excellent papers worldwide more than can be expected a new mapping approach using google maps based on statistical significance testing"
    - "how journal rankings can suppress interdisciplinary research a comparison between innovation studies and business management"
    - "scopus s source normalized impact per paper snip versus a journal impact factor based on fractional counting of citations"

Connected through hyperedge HE-7 (induced by source paper "ranking and mapping of universities and research focused institutions worldwide based on highly cited papers a visualization of results from multi level models"):
  with members:
    - "on the calculation of percentile based bibliometric indicators"
    - "the use of percentiles and percentile rank classes in the analysis of bibliometric data opportunities and limits"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "mapping excellence in the geography of science an approach based on scopus data"
    - "turning the tables in citation analysis one more time principles for comparing sets of documents"
    - "the detection of hot regions in the geography of science a visualization approach by using density maps"
    - "mapping the geography of science distribution patterns and networks of relations among cities and institutes"

Connected through hyperedge HE-8 (induced by source paper "the use of percentiles and percentile rank classes in the analysis of bibliometric data opportunities and limits"):
  with members:
    - "on the calculation of percentile based bibliometric indicators"
    - "accounting for the uncertainty in the evaluation of percentile ranks"
    - "a further step forward in measuring journals scientific prestige the sjr2 indicator"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "towards a new crown indicator some theoretical considerations"
    - "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.CY(Computers and Society)