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: "visualization of the citation impact environments of scientific journals an online mapping exercise"
  Abstract: Aggregated journal-journal citation networks based on the Journal Citation Reports 2004 of the Science Citation Index (5968 journals) and the Social Science Citation Index (1712 journals) are made accessible from the perspective of any of these journals. The user is thus able to analyze the citation environment in terms of links and graphs. Furthermore, the local impact of a journal is defined as its share of the total citations in the specific journal's citation environments; the vertical size of the nodes is varied proportionally to this citation impact. The horizontal size of each node can be used to provide the same information after correction for within-journal (self)-citations. In the "citing" environment, the equivalents of this measure can be considered as a citation activity index which maps how the relevant journal environment is perceived by the collective of authors of a given journal. As a policy application, the mechanism of interdisciplinary developments among the sciences is elaborated for the case of nanotechnology journals.

Connected through hyperedge HE-1 (induced by source paper "citation gaming induced by bibliometric evaluation a country level comparative analysis"):
  with members:
    - "do they agree bibliometric evaluation versus informed peer review in the italian research assessment exercise"
    - "interlocking editorship a network analysis of the links between economic journals"

Connected through hyperedge HE-2 (induced by source paper "measuring technological distance for patent mapping"):
  with members:
    - "interactive overlay maps for us patent uspto data based on international patent classifications ipc"
    - "co occurrence matrices and their applications in information science extending aca to the web environment"

Connected through hyperedge HE-3 (induced by source paper "network maps of technology fields a comparative analysis of relatedness measures"):
  with members:
    - "co occurrence matrices and their applications in information science extending aca to the web environment"

Connected through hyperedge HE-4 (induced by source paper "resygen a recommendation system generator using domain based heuristics"):
  with members:
    - "measuring the meaning of words in contexts an automated analysis of controversies about monarch butterflies frankenfoods and stem cells"
    - "co occurrence matrices and their applications in information science extending aca to the web environment"
    - "content based book recommending using learning for text categorization"

Connected through hyperedge HE-5 (induced by source paper "information metrics imetrics a research specialty with a socio cognitive identity"):
  with members:
    - "the dynamics of exchanges and references among scientific texts and the autopoiesis of discursive knowledge"
    - "an indicator of research front activity measuring intellectual organization as uncertainty reduction in document sets"

Connected through hyperedge HE-6 (induced by source paper "what the cited and citing environments reveal of advances in atmospheric sciences"):
  with members:
    - "can scientific journals be classified in terms of aggregated journal journal citation relations using the journal citation reports"

Connected through hyperedge HE-7 (induced by source paper "measuring the meaning of words in contexts an automated analysis of controversies about monarch butterflies frankenfoods and stem cells"):
  with members:
    - "co occurrence matrices and their applications in information science extending aca to the web environment"
    - "the construction and globalization of the knowledge base in inter human communication systems"
    - "the mutual information of university industry government relations an indicator of the triple helix dynamics"
    - "the university industry knowledge relationship analyzing patents and the science base of technologies"

Connected through hyperedge HE-8 (induced by source paper "a principal component analysis of 39 scientific impact measures"):
  with members:
    - "towards usage based impact metrics first results from the mesur project"
    - "usage impact factor the effects of sample characteristics on usage based impact metrics"
    - "earlier web usage statistics as predictors of later citation impact"
    - "toward alternative metrics of journal impact a comparison of download and citation data"

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)