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 relationship between scientists research performance and the degree of internationalization of their research"
  Abstract: Policy makers, at various levels of governance, generally encourage the development of research collaboration. However the underlying determinants of collaboration are not completely clear. In particular, the literature lacks studies that, taking the individual researcher as the unit of analysis, attempt to understand if and to what extent the researcher's scientific performance might impact on his/her degree of collaboration with foreign colleagues. The current work examines the international collaborations of Italian university researchers for the period 2001---2005, and puts them in relation to each individual's research performance. The results of the investigation, which assumes co-authorship as proxy of research collaboration, show that both research productivity and average quality of output have positive effects on the degree of international collaboration achieved by a scientist.

Connected through hyperedge HE-1 (induced by source paper "gender disparities in international research collaboration a large scale bibliometric study of 25 000 university professors"):
  with members:
    - "a gender analysis of top scientists collaboration behavior evidence from italy"
    - "academic collaboration rates and citation associations vary substantially between countries and fields"
    - "the collaboration behavior of top scientists"
    - "comparison of research productivity of italian and norwegian professors and universities"
    - "gender differences in scientific collaborations women are more egalitarian than men"
    - "gender differences in research collaboration"
    - "are researchers that collaborate more at the international level top performers an investigation on the italian university system"
    - "the contribution of star scientists to overall sex differences in research productivity"

Connected through hyperedge HE-2 (induced by source paper "when research assessment exercises leave room for opportunistic behavior by the subjects under evaluation"):
  with members:
    - "peer review versus bibliometrics which method better predicts the scholarly impact of publications"
    - "diversification versus specialization in scientific research which strategy pays off"
    - "on tit for tat franceschini and maisano versus anvur regarding the italian research assessment exercise vqr 2011 2014"
    - "bibliometric evaluation of research performance where do we stand"
    - "do they agree bibliometric evaluation versus informed peer review in the italian research assessment exercise"
    - "refrain from adopting the combination of citation and journal metrics to grade publications as used in the italian national research assessment exercise vqr 2011 2014"
    - "the vqr italy s second national research assessment methodological failures and ranking distortions"
    - "the determinants of academic career advancement evidence from italy"

Connected through hyperedge HE-3 (induced by source paper "the many faces of mobility using bibliometric data to measure the movement of scientists"):
  with members:
    - "tracing scientific mobility of early career researchers in spain and the netherlands through their publications"
    - "towards a global scientific brain indicators of researcher mobility using co affiliation data"

Connected through hyperedge HE-4 (induced by source paper "the relationship among research productivity research collaboration and their determinants"):
  with members:
    - "the combined effects of age and seniority on research performance of full professors"
    - "variation in research collaboration patterns across academic ranks"
    - "how do you define and measure research productivity"
    - "the collaboration behaviors of scientists in italy a field level analysis"
    - "gender differences in research collaboration"
    - "what is the appropriate length of the publication period over which to assess research performance"
    - "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 "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"
    - "a field standardized application of dea to national scale research assessment of universities"
    - "the contribution of star scientists to overall sex differences in research productivity"

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"
    - "university industry collaboration in italy a bibliometric examination"
    - "research collaboration and productivity is there correlation"

Connected through hyperedge HE-7 (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"
    - "a unified approach to mapping and clustering of bibliometric networks"
    - "university industry collaboration in italy a bibliometric examination"
    - "research collaboration and productivity is there correlation"

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)