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: "revisiting size effects in higher education research productivity"
  Abstract: The potential occurrence of variable returns to size in research activity is a factor to be considered in choices about the size of research organizations and also in the planning of national research assessment exercises, so as to avoid favoring those organizations that would benefit from such occurrence. The aim of the current work is to improve on weaknesses in past inquiries concerning returns to size through application of a research productivity measurement methodology that is more accurate and robust. The method involves field-standardized measurements that are free of the typical distortions of aggregate measurement by discipline or organization. The analysis is conducted for 183 hard science fields in all 77 Italian universities (time period 2004–2008) and allows detection of potential differences by field.

Connected through hyperedge HE-1 (induced by source paper "comparison of research productivity of italian and norwegian professors and universities"):
  with members:
    - "predicting publication long term impact through a combination of early citations and journal impact factor"
    - "the impact of unproductive and top researchers on overall university research performance"
    - "the elephant in the room the problem of quantifying productivity in evaluative scientometrics"
    - "the ratio of top scientists to the academic staff as an indicator of the competitive strength of universities"
    - "not dead just resting the practical value of per publication citation indicators"
    - "efficiency of research performance and the glass researcher"
    - "ranking research institutions by the number of highly cited articles per scientist"
    - "predicting the long term citation impact of recent publications"

Connected through hyperedge HE-2 (induced by source paper "the impact of unproductive and top researchers on overall university research performance"):
  with members:
    - "the dispersion of research performance within and between universities as a potential indicator of the competitive intensity in higher education systems"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "national scale research performance assessment at the individual level"
    - "research productivity are higher academic ranks more productive than lower ones"
    - "the dangers of performance based research funding in non competitive higher education systems"

Connected through hyperedge HE-3 (induced by source paper "the north south divide in the italian higher education system"):
  with members:
    - "accounting for gender research performance differences in ranking universities"
    - "do they agree bibliometric evaluation versus informed peer review in the italian research assessment exercise"
    - "a farewell to the mncs and like size independent indicators"
    - "a methodology to measure the effectiveness of academic recruitment and turnover"
    - "the vqr italy s second national research assessment methodological failures and ranking distortions"
    - "should the research performance of scientists be distinguished by gender"
    - "the determinants of academic career advancement evidence from italy"
    - "relatives in the same university faculty nepotism or merit"

Connected through hyperedge HE-4 (induced by source paper "a comparison of university performance scores and ranks by mncs and fss"):
  with members:
    - "testing the trade off between productivity and quality in research activities"
    - "a farewell to the mncs and like size independent indicators"
    - "efficiency of research performance and the glass researcher"
    - "evaluating university research same performance indicator different rankings"
    - "does quantity make a difference the importance of publishing many papers"
    - "ranking research institutions by the number of highly cited articles per scientist"
    - "how do you define and measure research productivity"
    - "measuring institutional research productivity for the life sciences the importance of accounting for the order of authors in the byline"

Connected through hyperedge HE-5 (induced by source paper "the ratio of top scientists to the academic staff as an indicator of the competitive strength of universities"):
  with members:
    - "measuring science irresistible temptations easy shortcuts and dangerous consequences"
    - "the impact of unproductive and top researchers on overall university research performance"
    - "from rankings to funnel plots the question of accounting for uncertainty when assessing university research performance"
    - "ranking research institutions by the number of highly cited articles per scientist"
    - "the determinants of academic career advancement evidence from italy"
    - "which of the world s institutions employ the most highly cited researchers an analysis of the data from highlycited com"
    - "how do you define and measure research productivity"
    - "variability of research performance across disciplines within universities in non competitive higher education systems"

Connected through hyperedge HE-6 (induced by source paper "from rankings to funnel plots the question of accounting for uncertainty when assessing university research performance"):
  with members:
    - "a farewell to the mncs and like size independent indicators"
    - "funnel plots for visualizing uncertainty in the research performance of institutions"
    - "how do you define and measure research productivity"
    - "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"
    - "what is the appropriate length of the publication period over which to assess research performance"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "the dispersion of research performance within and between universities as a potential indicator of the competitive intensity in higher education systems"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"

Connected through hyperedge HE-7 (induced by source paper "funnel plots for visualizing uncertainty in the research performance of institutions"):
  with members:
    - "the substantive and practical significance of citation impact differences between institutions guidelines for the analysis of percentiles using effect sizes and confidence intervals"
    - "how do you define and measure research productivity"
    - "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"
    - "caveats for using statistical significance tests in research assessments"
    - "what is the appropriate length of the publication period over which to assess research performance"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "the dispersion of research performance within and between universities as a potential indicator of the competitive intensity in higher education systems"
    - "revisiting the scaling of citations for research assessment"

Connected through hyperedge HE-8 (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 the scaling of citations for research assessment"
    - "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)