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: "a field standardized application of dea to national scale research assessment of universities"
  Abstract: The current work proposes an application of DEA methodology for measurement of technical and allocative efficiency of university research activity. The analysis is based on bibliometric data from the Italian university system for the five-year period 2004–2008. Technical and allocative efficiency is measured with input being considered as a university's research staff, classified according to academic rank, and with output considered as the field-standardized impact of the research product realized by these staff. The analysis is applied to all scientific disciplines of the so-called hard sciences, and conducted at subfield level, thus at a greater level of detail than ever before achieved in national-scale research assessments.

Connected through hyperedge HE-1 (induced by source paper "a sensitivity analysis of researchers productivity rankings to the time of citation observation"):
  with members:
    - "a sensitivity analysis of research institutions productivity rankings to the time of citation observation"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "national scale research performance assessment at the individual level"
    - "assessing the varying level of impact measurement accuracy as a function of the citation window length"
    - "evaluating research from informed peer review to bibliometrics"
    - "the first italian research assessment exercise a bibliometric perspective"
    - "allocative efficiency in public research funding can bibliometrics help"

Connected through hyperedge HE-2 (induced by source paper "are the authors of highly cited articles also the most productive ones"):
  with members:
    - "mapping excellence in national research systems the case of italy"
    - "measuring science irresistible temptations easy shortcuts and dangerous consequences"
    - "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"
    - "revisiting the scaling of citations for research assessment"
    - "a heuristic approach to author name disambiguation in bibliometrics databases for large scale research assessments"
    - "the relationship between scientists research performance and the degree of internationalization of their research"
    - "the contribution of star scientists to overall sex differences in research productivity"

Connected through hyperedge HE-3 (induced by source paper "variability of research performance across disciplines within universities in non competitive higher education systems"):
  with members:
    - "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"
    - "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"
    - "the dangers of performance based research funding in non competitive higher education systems"
    - "comparing bibliometric statistics obtained from the web of science and scopus"
    - "the measurement of italian universities research productivity by a non parametric bibliometric methodology"

Connected through hyperedge HE-4 (induced by source paper "a sensitivity analysis of research institutions productivity rankings to the time of citation observation"):
  with members:
    - "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"
    - "evaluating research from informed peer review to bibliometrics"

Connected through hyperedge HE-5 (induced by source paper "revisiting size effects in higher education research productivity"):
  with members:
    - "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"
    - "allocative efficiency in public research funding can bibliometrics help"

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)