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: "the detection of hot regions in the geography of science a visualization approach by using density maps"
  Abstract: Spatial scientometrics has attracted a lot of attention in the very recent past. The visualization methods (density maps) presented in this paper allow for an analysis revealing regions of excellence around the world using computer programs that are freely available. Based on Scopus and Web of Science data, field-specific and field-overlapping scientific excellence can be identified in broader regions (worldwide or for a specific continent) where high quality papers (highly cited papers or papers published in Nature or Science) were published. We used a geographic information system to produce our density maps. We also briefly discuss the use of Google Earth.

Connected through hyperedge HE-1 (induced by source paper "on the challenges ahead of spatial scientometrics focusing on the city level"):
  with members:
    - "the geography of references in elite articles which countries contribute to the archives of knowledge"
    - "a spatial scientometric analysis of the publication output of cities worldwide"
    - "exploring the position of cities in global corporate research and development a bibliometric analysis by two different geographical approaches"
    - "concentration of research funding leads to decreasing marginal returns"
    - "a methodology to compute the territorial productivity of scientists the case of italy"
    - "a new bibliometric approach to assess the scientific specialization of regions"
    - "the european union china and the united states in the top 1 and top 10 layers of most frequently cited publications competition and collaborations"
    - "mapping excellence in the geography of science an approach based on scopus data"

Connected through hyperedge HE-2 (induced by source paper "the evolution of ijhcs and chi a quantitative analysis"):
  with members:
    - "reducing the effort for systematic reviews in software engineering"
    - "towards evidence based ontology for supporting systematic literature review"
    - "what is the effect of country specific characteristics on the research performance of scientific institutions using multi level statistical models to rank and map universities and research focused institutions worldwide"

Connected through hyperedge HE-3 (induced by source paper "factors influencing cities publishing efficiency"):
  with members:
    - "the relationship among research productivity research collaboration and their determinants"
    - "the sum of it all revealing collaboration patterns by combining authorship and acknowledgements"
    - "a spatial scientometric analysis of the publication output of cities worldwide"
    - "the journal coverage of web of science and scopus a comparative analysis"
    - "evaluating university research same performance indicator different rankings"
    - "the european union china and the united states in the top 1 and top 10 layers of most frequently cited publications competition and collaborations"
    - "international scientific collaboration of china collaborating countries institutions and individuals"
    - "mapping excellence in the geography of science an approach based on scopus data"

Connected through hyperedge HE-4 (induced by source paper "strategic intelligence on emerging technologies scientometric overlay mapping"):
  with members:
    - "what is an emerging technology"
    - "patents as instruments for exploring innovation dynamics geographic and technological perspectives on photovoltaic cells"
    - "interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal journal citations"
    - "bibliometric perspectives on medical innovation using the medical subject headings mesh of pubmed"
    - "a new methodology for constructing a publication level classification system of science"
    - "mapping uspto patent data using overlays to google maps"
    - "mapping the geography of science distribution patterns and networks of relations among cities and institutes"
    - "science overlay maps a new tool for research policy and library management"

Connected through hyperedge HE-5 (induced by source paper "a spatial scientometric analysis of the publication output of cities worldwide"):
  with members:
    - "mapping spatial and temporal changes of global corporate research and development activities by conducting a bibliometric analysis"
    - "exploring the position of cities in global corporate research and development a bibliometric analysis by two different geographical approaches"
    - "the journal coverage of web of science and scopus a comparative analysis"
    - "how have the eastern european countries of the former warsaw pact developed since 1990 a bibliometric study"
    - "mapping excellence in the geography of science an approach based on scopus data"
    - "globalisation of science in kilometres"
    - "mapping the geography of science distribution patterns and networks of relations among cities and institutes"

Connected through hyperedge HE-6 (induced by source paper "a methodology to compute the territorial productivity of scientists the case of italy"):
  with members:
    - "mapping excellence in national research systems the case of italy"
    - "measuring science irresistible temptations easy shortcuts and dangerous consequences"
    - "a new approach to measure the scientific strengths of territories"
    - "a new bibliometric approach to assess the scientific specialization of regions"
    - "how do you define and measure research productivity"
    - "individual research performance a proposal for comparing apples to oranges"
    - "revisiting size effects in higher education research productivity"
    - "revisiting the scaling of citations for research assessment"

Connected through hyperedge HE-7 (induced by source paper "a new approach to measure the scientific strengths of territories"):
  with members:
    - "the knowledge based economy and the triple helix model"
    - "revisiting the scaling of citations for research assessment"
    - "mapping excellence in the geography of science an approach based on scopus data"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"

Connected through hyperedge HE-8 (induced by source paper "what is the effect of country specific characteristics on the research performance of scientific institutions using multi level statistical models to rank and map universities and research focused institutions worldwide"):
  with members:
    - "national peer review research assessment exercises for the hard sciences can be a complete waste of money the italian case"
    - "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"
    - "on the calculation of percentile based bibliometric indicators"
    - "how to improve the prediction based on citation impact percentiles for years shortly after the publication date"
    - "the use of percentiles and percentile rank classes in the analysis of bibliometric data opportunities and limits"
    - "a further step forward in measuring journals scientific prestige the sjr2 indicator"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "mapping excellence in the geography of science an approach based on scopus data"

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)