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: "interactive overlay maps for us patent uspto data based on international patent classifications ipc"
  Abstract: We report on the development of an interface to the US Patent and Trademark Office (USPTO) that allows for the mapping of patent portfolios as overlays to basemaps constructed from citation relations among all patents contained in this database during the period 1976-2011. Both the interface and the data are in the public domain; the freeware programs VOSViewer and/or Pajek can be used for the visualization. These basemaps and overlays can be generated at both the 3-digit and 4-digit levels of the International Patent Classifications (IPC) of the World Intellectual Property Organization (WIPO). The basemaps can provide a stable mental framework for analysts to follow developments over searches for different years, which can be animated. The full flexibility of the advanced search engines of USPTO are available for generating sets of patents and/or patent applications which can thus be visualized and compared. This instrument allows for addressing questions about technological distance, diversity in portfolios, and animating the developments of both technologies and technological capacities of organizations over time.

Connected through hyperedge HE-1 (induced by source paper "measuring technological distance for patent mapping"):
  with members:
    - "co occurrence matrices and their applications in information science extending aca to the web environment"
    - "visualization of the citation impact environments of scientific journals an online mapping exercise"

Connected through hyperedge HE-2 (induced by source paper "what is an emerging technology"):
  with members:
    - "prediction of emerging technologies based on analysis of the us patent citation network"
    - "interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal journal citations"
    - "bibliometric perspectives on medical innovation using the medical subject headings mesh of pubmed"
    - "mapping uspto patent data using overlays to google maps"
    - "the local emergence and global diffusion of research technologies an exploration of patterns of network formation"
    - "measuring contextual citation impact of scientific journals"
    - "an indicator of research front activity measuring intellectual organization as uncertainty reduction in document sets"
    - "science overlay maps a new tool for research policy and library management"

Connected through hyperedge HE-3 (induced by source paper "can technology life cycles be indicated by diversity in patent classifications the crucial role of variety"):
  with members:
    - "patents as instruments for exploring innovation dynamics geographic and technological perspectives on photovoltaic cells"
    - "knowledge generating efficiency in innovation systems the relation between structural and temporal effects"
    - "interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal journal citations"
    - "how journal rankings can suppress interdisciplinary research a comparison between innovation studies and business management"

Connected through hyperedge HE-4 (induced by source paper "interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal journal citations"):
  with members:
    - "global maps of science based on the new web of science categories"
    - "interdisciplinarity at the journal and specialty level the changing knowledge bases of the journal cognitive science"
    - "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"

Connected through hyperedge HE-5 (induced by source paper "challenges for regional innovation policies in cee countries spatial concentration and foreign control of us patenting"):
  with members:
    - "mapping uspto patent data using overlays to google maps"
    - "the university industry knowledge relationship analyzing patents and the science base of technologies"

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)