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: "fractional counting of citations in research evaluation a cross and interdisciplinary assessment of the tsinghua university in beijing"
  Abstract: In the case of the scientometric evaluation of multi- or interdisciplinary units one risks to compare apples with oranges: each paper has to be assessed in comparison to an appropriate reference set. We suggest that the set of citing papers can be considered as the relevant representation of the field of impact. In order to normalize for differences in citation behavior among fields, citations can be fractionally counted proportionately to the length of the reference lists in the citing papers. This new method enables us to compare among units with different disciplinary affiliations at the paper level and also to assess the statistical significance of differences among sets. Twenty-seven departments of the Tsinghua University in Beijing are thus compared. Among them, the Department of Chinese Language and Linguistics is upgraded from the 19th to the second position in the ranking. The overall impact of 19 of the 27 departments is not significantly different at the 5% level when thus normalized for different citation potentials.

Connected through hyperedge HE-1 (induced by source paper "comprehensive indicator comparisons intelligible to non experts the case of two snip versions"):
  with members:
    - "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"
    - "measuring contextual citation impact of scientific journals"

Connected through hyperedge HE-2 (induced by source paper "bibliometric indicators of young authors in astrophysics can later stars be predicted"):
  with members:
    - "a systematic empirical comparison of different approaches for normalizing citation impact indicators"
    - "which percentile based approach should be preferred for calculating normalized citation impact values an empirical comparison of five approaches including a newly developed citation rank approach p100"
    - "a bibliometric index based on the complete list of cited publications"
    - "the weakening relationship between the impact factor and papers citations in the digital age"
    - "rescaling citations of publications in physics"
    - "the inconsistency of the h index"
    - "caveats for the journal and field normalizations in the cwts leiden evaluations of research performance"
    - "towards a new crown indicator an empirical analysis"

Connected through hyperedge HE-3 (induced by source paper "a systematic empirical comparison of different approaches for normalizing citation impact indicators"):
  with members:
    - "citation analysis may severely underestimate the impact of clinical research as compared to basic research"
    - "on the calculation of percentile based bibliometric indicators"
    - "source normalized indicators of citation impact an overview of different approaches and an empirical comparison"
    - "field normalized impact factors a comparison of rescaling versus fractionally counted ifs"
    - "a new methodology for constructing a publication level classification system of science"
    - "revisiting the scaling of citations for research assessment"
    - "how can journal impact factors be normalized across fields of science an assessment in terms of percentile ranks and fractional counts"
    - "some modifications to the snip journal impact indicator"

Connected through hyperedge HE-4 (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"
    - "testing differences statistically with the leiden ranking"
    - "universality of citation distributions revisited"

Connected through hyperedge HE-5 (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"
    - "betweenness centrality as a driver of preferential attachment in the evolution of research collaboration networks"
    - "testing differences statistically with the leiden ranking"
    - "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-6 (induced by source paper "how can journal impact factors be normalized across fields of science an assessment in terms of percentile ranks and fractional counts"):
  with members:
    - "alternatives to the journal impact factor i3 and the top 10 or top 25 of the most highly cited papers"
    - "accounting for the uncertainty in the evaluation of percentile ranks"
    - "impact factor outdated artefact or stepping stone to journal certification"
    - "percentile ranks and the integrated impact indicator i3"
    - "universality of citation distributions revisited"
    - "an evaluation of impacts in nanoscience nanotechnology steps towards standards for citation analysis"
    - "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 "source normalized indicators of citation impact an overview of different approaches and an empirical comparison"):
  with members:
    - "citation analysis may severely underestimate the impact of clinical research as compared to basic research"
    - "a new methodology for constructing a publication level classification system of science"
    - "how can journal impact factors be normalized across fields of science an assessment in terms of percentile ranks and fractional counts"
    - "some modifications to the snip journal impact indicator"
    - "a recursive field normalized bibliometric performance indicator an application to the field of library and information science"
    - "scopus s source normalized impact per paper snip versus a journal impact factor based on fractional counting of citations"
    - "towards a new crown indicator some theoretical considerations"
    - "severe language effect in university rankings particularly germany and france are wronged in citation based rankings"

Connected through hyperedge HE-8 (induced by source paper "an evaluation of impacts in nanoscience nanotechnology steps towards standards for citation analysis"):
  with members:
    - "alternatives to the journal impact factor i3 and the top 10 or top 25 of the most highly cited papers"
    - "how can journal impact factors be normalized across fields of science an assessment in terms of percentile ranks and fractional counts"
    - "percentile ranks and the integrated impact indicator i3"
    - "interactive overlays a new method for generating global journal maps from web of science data"
    - "which cities produce excellent papers worldwide more than can be expected a new mapping approach using google maps based on statistical significance testing"
    - "the structure of the arts humanities citation index a mapping on the basis of aggregated citations among 1 157 journals"
    - "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"

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)