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: "research collaboration and productivity is there correlation"
  Abstract: The incidence of extramural collaboration in academic research activities is increasing as a result of various factors. These factors include policy measures aimed at fostering partnership and networking among the various components of the research system, policies which are in turn justified by the idea that knowledge sharing could increase the effectiveness of the system. Over the last two decades, the scientific community has also stepped up activities to assess the actual impact of collaboration intensity on the performance of research systems. This study draws on a number of empirical analyses, with the intention of measuring the effects of extramural collaboration on research performance and, indirectly, verifying the legitimacy of policies that support this type of collaboration. The analysis focuses on the Italian academic research system. The aim of the work is to assess the level of correlation, at institutional level, between scientific productivity and collaboration intensity as a whole, both internationally and with private organizations. This will be carried out using a bibliometric type of approach, which equates collaboration with the co-authorship of scientific publications.

Connected through hyperedge HE-1 (induced by source paper "an individual level assessment of the relationship between spin off activities and research performance in universities"):
  with members:
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "national scale research performance assessment at the individual level"
    - "the alignment of public research supply and industry demand for effective technology transfer the case of italy"

Connected through hyperedge HE-2 (induced by source paper "mapping excellence in national research systems the case of italy"):
  with members:
    - "measuring science irresistible temptations easy shortcuts and dangerous consequences"
    - "the measurement of italian universities research productivity by a non parametric bibliometric methodology"

Connected through hyperedge HE-3 (induced by source paper "the research production of nations and departments a statistical model for the share of publications"):
  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"
    - "a multivariate stochastic model to assess research performance"
    - "funnel plots for visualizing uncertainty in the research performance of institutions"
    - "how do you define and measure research productivity"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "research productivity are higher academic ranks more productive than lower ones"
    - "the first italian research assessment exercise a bibliometric perspective"

Connected through hyperedge HE-4 (induced by source paper "should the research performance of scientists be distinguished by gender"):
  with members:
    - "individual research performance a proposal for comparing apples to oranges"
    - "the importance of accounting for the number of co authors and their order when assessing research performance at the individual level in the life sciences"
    - "gender differences in research collaboration"
    - "what is the appropriate length of the publication period over which to assess research performance"
    - "revisiting size effects in higher education research productivity"
    - "revisiting the scaling of citations for research assessment"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "research productivity are higher academic ranks more productive than lower ones"

Connected through hyperedge HE-5 (induced by source paper "variation in research collaboration patterns across academic ranks"):
  with members:
    - "the impact of unproductive and top researchers on overall university research performance"
    - "the collaboration behaviors of scientists in italy a field level analysis"
    - "gender differences in research collaboration"
    - "are researchers that collaborate more at the international level top performers an investigation on the italian university system"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "assessing the varying level of impact measurement accuracy as a function of the citation window length"
    - "research productivity are higher academic ranks more productive than lower ones"

Connected through hyperedge HE-6 (induced by source paper "the collaboration behaviors of scientists in italy a field level analysis"):
  with members:
    - "assessing national strengths and weaknesses in research fields"
    - "gender differences in research collaboration"
    - "identifying interdisciplinarity through the disciplinary classification of coauthors of scientific publications"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "the dangers of performance based research funding in non competitive higher education systems"
    - "the relationship between scientists research performance and the degree of internationalization of their research"
    - "university industry collaboration in italy a bibliometric examination"

Connected through hyperedge HE-7 (induced by source paper "gender differences in research collaboration"):
  with members:
    - "the impact of unproductive and top researchers on overall university research performance"
    - "the collaboration behaviors of scientists in italy a field level analysis"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "gender differences in research productivity a bibliometric analysis of the italian academic system"
    - "the contribution of star scientists to overall sex differences in research productivity"

Connected through hyperedge HE-8 (induced by source paper "identifying interdisciplinarity through the disciplinary classification of coauthors of scientific publications"):
  with members:
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "university industry research collaboration a model to assess university capability"
    - "the relationship between scientists research performance and the degree of internationalization of their research"
    - "a unified approach to mapping and clustering of bibliometric networks"
    - "university industry collaboration in italy a bibliometric examination"

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)