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: "mapping academic institutions according to their journal publication profile spanish universities as a case study"
  Abstract: We introduce a novel methodology for mapping academic institutions based on their journal publication profiles. We believe that journals in which researchers from academic institutions publish their works can be considered as useful identifiers for representing the relationships between these institutions and establishing comparisons. However, when academic journals are used for research output representation, distinctions must be introduced between them, based on their value as institution descriptors. This leads us to the use of journal weights attached to the institution identifiers. Since a journal in which researchers from a large proportion of institutions published their papers may be a bad indicator of similarity between two academic institutions, it seems reasonable to weight it in accordance with how frequently researchers from different institutions published their papers in this journal. Cluster analysis can then be applied to group the academic institutions, and dendrograms can be provided to illustrate groups of institutions following agglomerative hierarchical clustering. In order to test this methodology, we use a sample of Spanish universities as a case study. We first map the study sample according to an institution's overall research output, then we use it for two scientific fields (Information and Communication Technologies, as well as Medicine and Pharmacology) as a means to demonstrate how our methodology can be applied, not only for analyzing institutions as a whole, but also in different disciplinary contexts. © 2012 Wiley Periodicals, Inc.

Connected through hyperedge HE-1 (induced by source paper "analyzing the disciplinary focus of universities can rankings be a one size fits all"):
  with members:
    - "what do university rankings by fields rank exploring discrepancies between the organizational structure of universities and bibliometric classifications"
    - "does google scholar contain all highly cited documents 1950 2013"
    - "an insight into the importance of national university rankings in an international context the case of the i ugr rankings of spanish universities"
    - "citation analysis may severely underestimate the impact of clinical research as compared to basic research"
    - "reviewers ratings and bibliometric indicators hand in hand when assessing over research proposals"
    - "the google scholar experiment how to index false papers and manipulate bibliometric indicators"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "the dangers of performance based research funding in non competitive higher education systems"

Connected through hyperedge HE-2 (induced by source paper "what do university rankings by fields rank exploring discrepancies between the organizational structure of universities and bibliometric classifications"):
  with members:
    - "an insight into the importance of national university rankings in an international context the case of the i ugr rankings of spanish universities"
    - "ranking and mapping of universities and research focused institutions worldwide based on highly cited papers a visualization of results from multi level models"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "source normalized indicators of citation impact an overview of different approaches and an empirical comparison"
    - "a new methodology for constructing a publication level classification system of 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"
    - "measuring contextual citation impact of scientific journals"

Connected through hyperedge HE-3 (induced by source paper "an insight into the importance of national university rankings in an international context the case of the i ugr rankings of spanish universities"):
  with members:
    - "reviewers ratings and bibliometric indicators hand in hand when assessing over research proposals"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "the dangers of performance based research funding in non competitive higher education systems"

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)