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: "how can journal impact factors be normalized across fields of science an assessment in terms of percentile ranks and fractional counts"
  Abstract: Using the CD-ROM version of the Science Citation Index 2010 (N = 3,705 journals), we study the (combined) effects of (i) fractional counting on the impact factor (IF) and (ii) transformation of the skewed citation distributions into a distribution of 100 percentiles and six percentile rank classes (top-1%, top-5%, etc.). Do these approaches lead to field-normalized impact measures for journals? In addition to the two-year IF (IF2), we consider the five-year IF (IF5), the respective numerators of these IFs, and the number of Total Cites, counted both as integers and fractionally. These various indicators are tested against the hypothesis that the classification of journals into 11 broad fields by PatentBoard/National Science Foundation provides statistically significant between-field effects. Using fractional counting the between-field variance is reduced by 91.7% in the case of IF5, and by 79.2% in the case of IF2. However, the differences in citation counts are not significantly affected by fractional counting. These results accord with previous studies, but the longer citation window of a fractionally counted IF5 can lead to significant improvement in the normalization across fields.

Connected through hyperedge HE-1 (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-2 (induced by source paper "citation score normalized by cited references csncr the introduction of a new citation impact indicator"):
  with members:
    - "a review of theory and practice in scientometrics"
    - "a review of the literature on citation impact indicators"
    - "investigation of partition cells as a structural basis suitable for assessments of individual scientists"
    - "methods for the generation of normalized citation impact scores in bibliometrics which method best reflects the judgements of experts"
    - "growth in the number of references in engineering journal papers during the 1972 2013 period"
    - "on the causes of subject specific citation rates in web of science"
    - "universality of scholarly impact metrics"
    - "citation analysis may severely underestimate the impact of clinical research as compared to basic research"

Connected through hyperedge HE-3 (induced by source paper "a review of the literature on citation impact indicators"):
  with members:
    - "a sensitivity analysis of researchers productivity rankings to the time of citation observation"
    - "the precision of the arithmetic mean geometric mean and percentiles for citation data an experimental simulation modelling approach"
    - "the journal coverage of web of science and scopus a comparative analysis"
    - "measuring academic influence not all citations are equal"
    - "a review of theory and practice in scientometrics"
    - "comprehensive indicator comparisons intelligible to non experts the case of two snip versions"
    - "methods for estimating the size of google scholar"
    - "large scale analysis of the accuracy of the journal classification systems of web of science and scopus"

Connected through hyperedge HE-4 (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"
    - "some modifications to the snip journal impact indicator"
    - "fractional counting of citations in research evaluation a cross and interdisciplinary assessment of the tsinghua university in beijing"

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"
    - "fractional counting of citations in research evaluation a cross and interdisciplinary assessment of the tsinghua university in beijing"
    - "testing differences statistically with the leiden ranking"
    - "universality of citation distributions revisited"

Connected through hyperedge HE-6 (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"
    - "some modifications to the snip journal impact indicator"
    - "fractional counting of citations in research evaluation a cross and interdisciplinary assessment of the tsinghua university in beijing"
    - "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-7 (induced by source paper "some modifications to the snip journal impact indicator"):
  with members:
    - "a further step forward in measuring journals scientific prestige the sjr2 indicator"
    - "source normalized indicators of citation impact an overview of different approaches and an empirical comparison"
    - "the inconsistency of the h index"
    - "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"
    - "the relation between eigenfactor audience factor and influence weight"
    - "measuring contextual citation impact of scientific journals"

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"
    - "percentile ranks and the integrated impact indicator i3"
    - "fractional counting of citations in research evaluation a cross and interdisciplinary assessment of the tsinghua university in beijing"
    - "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)