human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "mapping patent classifications portfolio and statistical analysis and the comparison of strengths and weaknesses"):
  Abstract: The Cooperative Patent Classifications (CPC) jointly developed by the European and US Patent Offices provide a new basis for mapping and portfolio analysis. This update provides an occasion for rethinking the parameter choices. The new maps are significantly different from previous ones, although this may not always be obvious on visual inspection. Since these maps are statistical constructs based on index terms, their quality--as different from utility--can only be controlled discursively. We provide nested maps online and a routine for portfolio overlays and further statistical analysis. We add a new tool for "difference maps" which is illustrated by comparing the portfolios of patents granted to Novartis and MSD in 2016.

Includes members:
  Member "measuring technological distance for patent mapping":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "technet technology semantic network based on patent data")
  Member "strategic intelligence on emerging technologies scientometric overlay mapping":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "data mining the foundational patents of photovoltaic materials an application of patent citation spectroscopy")
  Member "generating clustered journal maps an automated system for hierarchical classification":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "granularity of algorithmically constructed publication level classifications of research publications identification of topics")
  Member "patent portfolio analysis of cities statistics and maps of technological inventiveness":
    also connected through other hyperedges:
      (none)
  Member "journal portfolio analysis for countries cities and organizations maps and comparisons":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "construction of a pragmatic base line for journal classifications and maps based on aggregated journal journal citation relations")
  Member "patents as instruments for exploring innovation dynamics geographic and technological perspectives on photovoltaic cells":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "data mining the foundational patents of photovoltaic materials an application of patent citation spectroscopy")
  Member "can technology life cycles be indicated by diversity in patent classifications the crucial role of variety":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "betweenness and diversity in journal citation networks as measures of interdisciplinarity a tribute to eugene garfield")
  Member "science visualization and discursive knowledge":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "networks of reader and country status an analysis of mendeley reader statistics")

Question: Please tell me which class the source paper 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)