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: "towards usage based impact metrics first results from the mesur project"
  Abstract: Scholarly usage data holds the potential to be used as a tool to study the dynamics of scholarship in real time, and to form the basis for the definition of novel metrics of scholarly impact. However, the formal groundwork to reliably and validly exploit usage data is lacking, and the exact nature, meaning and applicability of usage-based metrics is poorly understood. The MESUR project funded by the Andrew W. Mellon Foundation constitutes a systematic effort to define, validate and cross-validate a range of usage-based metrics of scholarly impact. MESUR has collected nearly 1 billion usage events as well as all associated bibliographic and citation data from significant publishers, aggregators and institutional consortia to construct a large-scale usage data reference set. This paper describes some major challenges related to aggregating and processing usage data, and discusses preliminary results obtained from analyzing the MESUR reference data set. The results confirm the intrinsic value of scholarly usage data, and support the feasibility of reliable and valid usage-based metrics of scholarly impact.

Connected through hyperedge HE-1 (induced by source paper "readership data and research impact"):
  with members:
    - "microsoft academic a multidisciplinary comparison of citation counts with scopus and mendeley for 29 journals"
    - "do researchgate scores create ghost academic reputations"
    - "three practical field normalised alternative indicator formulae for research evaluation"
    - "on full text download and citation distributions in scientific scholarly journals"
    - "do mendeley readership counts help to filter highly cited wos publications better than average citation impact of journals jcs"
    - "national research impact indicators from mendeley readers"
    - "tweets vs mendeley readers how do these two social media metrics differ"
    - "how well developed are altmetrics a cross disciplinary analysis of the presence of alternative metrics in scientific publications"

Connected through hyperedge HE-2 (induced by source paper "normalization of zero inflated data an empirical analysis of a new indicator family and its use with altmetrics data"):
  with members:
    - "three practical field normalised alternative indicator formulae for research evaluation"
    - "how many scientific papers are mentioned in policy related documents an empirical investigation using web of science and altmetric data"
    - "grand challenges in altmetrics heterogeneity data quality and dependencies"
    - "policy documents as sources for measuring societal impact how often is climate change research mentioned in policy related documents"
    - "national research impact indicators from mendeley readers"
    - "validity of altmetrics data for measuring societal impact a study using data from altmetric and f1000prime"
    - "tweets vs mendeley readers how do these two social media metrics differ"
    - "investigation of partition cells as a structural basis suitable for assessments of individual scientists"

Connected through hyperedge HE-3 (induced by source paper "how well developed are altmetrics a cross disciplinary analysis of the presence of alternative metrics in scientific publications"):
  with members:
    - "tracing scientist s research trends realtimely"
    - "is there currently a scientific revolution in scientometrics"
    - "coverage and adoption of altmetrics sources in the bibliometric community"
    - "how the scientific community reacts to newly submitted preprints article downloads twitter mentions and citations"
    - "the validation of advanced bibliometric indicators through peer assessments a comparative study using data from incites and f1000"
    - "beyond citations scholars visibility on the social web"
    - "manipulating google scholar citations and google scholar metrics simple easy and tempting"
    - "altmetrics in the wild using social media to explore scholarly impact"

Connected through hyperedge HE-4 (induced by source paper "grammar based geodesics in semantic networks"):
  with members:
    - "exposing multi relational networks to single relational network analysis algorithms"
    - "grammar based random walkers in semantic networks"
    - "mapping semantic networks to undirected networks"
    - "social decision making with multi relational networks and grammar based particle swarms"

Connected through hyperedge HE-5 (induced by source paper "a recommender system to support the scholarly communication process"):
  with members:
    - "exposing multi relational networks to single relational network analysis algorithms"
    - "automatic metadata generation using associative networks"
    - "grammar based random walkers in semantic networks"
    - "an algorithm to determine peer reviewers"
    - "a practical ontology for the large scale modeling of scholarly artifacts and their usage"
    - "a multi relational network to support the scholarly communication process"

Connected through hyperedge HE-6 (induced by source paper "a principal component analysis of 39 scientific impact measures"):
  with members:
    - "visualization of the citation impact environments of scientific journals an online mapping exercise"
    - "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"

Connected through hyperedge HE-7 (induced by source paper "faith in the algorithm part 1 beyond the turing test"):
  with members:
    - "revisiting the age of enlightenment from a collective decision making systems perspective"
    - "a distributed process infrastructure for a distributed data structure"
    - "a social network for societal scale decision making systems"

Connected through hyperedge HE-8 (induced by source paper "interpretations of the web of data"):
  with members:
    - "grammar based random walkers in semantic networks"

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)