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: "gender differences in research collaboration"
  Abstract: The debate on the role of women in the academic world has focused on various phenomena that could be at the root of the gender gap seen in many nations. However, in spite of the ever more collaborative character of scientific research, the issue of gender aspects in research collaborations has been treated in a marginal manner. In this article we apply an innovative bibliometric approach based on the propensity for collaboration by individual academics, which permits measurement of gender differences in the propensity to collaborate by fields, disciplines and forms of collaboration: intramural, extramural domestic and international. The analysis of the scientific production of Italian academics shows that women researchers register a greater capacity to collaborate in all the forms analyzed, with the exception of international collaboration, where there is still a gap in comparison to male colleagues.

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"
    - "are researchers that collaborate more at the international level top performers an investigation on the italian university system"
    - "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-2 (induced by source paper "authorship analysis of specialized vs diversified research output"):
  with members:
    - "diversification versus specialization in scientific research which strategy pays off"
    - "the effects of gender age and academic rank on research diversification"
    - "the effect of multidisciplinary collaborations on research diversification"
    - "do interdisciplinary research teams deliver higher gains to science"
    - "specialization versus diversification in research activities the extent intensity and relatedness of field diversification by individual scientists"
    - "the relationship among research productivity research collaboration and their determinants"
    - "does your surname affect the citability of your publications"
    - "variation in research collaboration patterns across academic ranks"

Connected through hyperedge HE-3 (induced by source paper "the collaboration behavior of top scientists"):
  with members:
    - "measuring science irresistible temptations easy shortcuts and dangerous consequences"
    - "revisiting the scientometric conceptualization of impact and its measurement"
    - "the relationship among research productivity research collaboration and their determinants"
    - "variation in research collaboration patterns across academic ranks"
    - "how do you define and measure research productivity"
    - "individual research performance a proposal for comparing apples to oranges"
    - "the collaboration behaviors of scientists in italy a field level analysis"
    - "are researchers that collaborate more at the international level top performers an investigation on the italian university system"

Connected through hyperedge HE-4 (induced by source paper "a gender analysis of top scientists collaboration behavior evidence from italy"):
  with members:
    - "the collaboration behavior of top scientists"
    - "gender differences in scientific collaborations women are more egalitarian than men"
    - "the relationship among research productivity research collaboration and their determinants"
    - "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"
    - "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"

Connected through hyperedge HE-5 (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"
    - "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"
    - "the relationship between scientists research performance and the degree of internationalization of their research"

Connected through hyperedge HE-6 (induced by source paper "the specific shapes of gender imbalance in scientific authorships a network approach"):
  with members:
    - "should the research performance of scientists be distinguished by gender"
    - "large scale analysis of the accuracy of the journal classification systems of web of science and scopus"
    - "variation in research collaboration patterns across academic ranks"
    - "the operationalization of fields as wos subject categories wcs in evaluative bibliometrics the cases of library and information science and science technology studies"

Connected through hyperedge HE-7 (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"
    - "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"
    - "gender differences in research productivity a bibliometric analysis of the italian academic system"

Connected through hyperedge HE-8 (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"
    - "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"
    - "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)