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: "publish or patent bibliometric evidence for empirical trade offs in national funding strategies"
  Abstract: Multivariate linear regression models suggest a trade-off in allocations of national R&D investments. Government funding, and spending in the higher education sector, seem to encourage publications, whereas other components such as industrial funding, and spending in the business sector, encourage patenting. Our results help explain why the US trails the EU in publications, because of its focus on industrial funding - some 70% of its total R&D investment. Conversely, it also helps explain why the EU trails the US in patenting. Government funding is indicated as a negative incentive to high-quality patenting. The models here can also be used to predict an output indicator for a country, once the appropriate input indicator is known. This usually is done within a dataset for a single year, but the process can be extended to predict outputs a few years into the future, if reasonable forecasts can be made of the input indicators. We provide new forecasts about the further relationships of the US, the EU-27, and the PRC in the case of publishing. Models for individual countries may be more successful, however, than regression models whose parameters are averaged over a set of countries.

Connected through hyperedge HE-1 (induced by source paper "data mining the foundational patents of photovoltaic materials an application of patent citation spectroscopy"):
  with members:
    - "strategic intelligence on emerging technologies scientometric overlay mapping"
    - "patent citation spectroscopy pcs algorithmic retrieval of landmark patents"
    - "citation algorithms for identifying research milestones driving biomedical innovation"
    - "introducing citedreferencesexplorer crexplorer a program for reference publication year spectroscopy with cited references standardization"
    - "patents as instruments for exploring innovation dynamics geographic and technological perspectives on photovoltaic cells"
    - "detecting the historical roots of research fields by reference publication year spectroscopy rpys"

Connected through hyperedge HE-2 (induced by source paper "the relative influences of government funding and international collaboration on citation impact"):
  with members:
    - "on the calculation of percentile based bibliometric indicators"

Connected through hyperedge HE-3 (induced by source paper "the european union china and the united states in the top 1 and top 10 layers of most frequently cited publications competition and collaborations"):
  with members:
    - "how are excellent highly cited papers defined in bibliometrics a quantitative analysis of the literature"
    - "brics countries and scientific excellence a bibliometric analysis of most frequently cited papers"
    - "how have the eastern european countries of the former warsaw pact developed since 1990 a bibliometric study"
    - "caveats for using statistical significance tests in research assessments"
    - "the use of percentiles and percentile rank classes in the analysis of bibliometric data opportunities and limits"
    - "the leiden ranking 2011 2012 data collection indicators and interpretation"
    - "testing differences statistically with the leiden ranking"
    - "world shares of publications of the usa eu 27 and china compared and predicted using the new interface of the web of science versus scopus"

Connected through hyperedge HE-4 (induced by source paper "mapping r d support infrastructures a scientometric and webometric study of uk science parks"):
  with members:
    - "mapping the network structure of science parks an exploratory study of cross sectoral interactions reflected on the web"
    - "the entrepreneurial role of the university a link analysis of york science park"
    - "a bibliometric tool to assess the regional dimension of university industry research collaborations"

Connected through hyperedge HE-5 (induced by source paper "knowledge generating efficiency in innovation systems the relation between structural and temporal effects"):
  with members:
    - "rotational symmetry and the transformation of innovation systems in a triple helix of university industry government relations"

Connected through hyperedge HE-6 (induced by source paper "interactive overlay maps for us patent uspto data based on international patent classifications ipc"):
  with members:
    - "how to create an innovation accelerator"
    - "interactive overlays a new method for generating global journal maps from web of science data"
    - "which cities produce excellent papers worldwide more than can be expected a new mapping approach using google maps based on statistical significance testing"
    - "the structure of the arts humanities citation index a mapping on the basis of aggregated citations among 1 157 journals"
    - "how journal rankings can suppress interdisciplinary research a comparison between innovation studies and business management"
    - "a unified approach to mapping and clustering of bibliometric networks"
    - "indicators of the interdisciplinarity of journals diversity centrality and citations"
    - "a comparison of two techniques for bibliometric mapping multidimensional scaling and vos"

Connected through hyperedge HE-7 (induced by source paper "mapping uspto patent data using overlays to google maps"):
  with members:
    - "the knowledge based economy and the triple helix model"
    - "mapping excellence in the geography of science an approach based on scopus data"
    - "which cities produce excellent papers worldwide more than can be expected a new mapping approach using google maps based on statistical significance testing"
    - "mapping the geography of science distribution patterns and networks of relations among cities and institutes"
    - "the university industry knowledge relationship analyzing patents and the science base of technologies"
    - "science overlay maps a new tool for research policy and library management"

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)