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 "does google scholar contain all highly cited documents 1950 2013"):
  Abstract: The study of highly cited documents on Google Scholar (GS) has never been addressed to date in a comprehensive manner. The objective of this work is to identify the set of highly cited documents in Google Scholar and define their core characteristics: their languages, their file format, or how many of them can be accessed free of charge. We will also try to answer some additional questions that hopefully shed some light about the use of GS as a tool for assessing scientific impact through citations. The decalogue of research questions is shown below: #R##N#1. Which are the most cited documents in GS? #R##N#2. Which are the most cited document types in GS? #R##N#3. What languages are the most cited documents written in GS? #R##N#4. How many highly cited documents are freely accessible? #R##N#4.1 What file types are the most commonly used to store these highly cited documents? #R##N#4.2 Which are the main providers of these documents? #R##N#5. How many of the highly cited documents indexed by GS are also indexed by WoS? #R##N#6. Is there a correlation between the number of citations that these highly cited documents have received in GS and the number of citations they have received in WoS? #R##N#7. How many versions of these highly cited documents has GS detected? #R##N#8. Is there a correlation between the number of versions GS has detected for these documents, and the number citations they have received? #R##N#9. Is there a correlation between the number of versions GS has detected for these documents, and their position in the search engine result pages? #R##N#10. Is there some relation between the positions these documents occupy in the search engine result pages, and the number of citations they have received?

Includes members:
  Member "google scholar metrics 2014 a low cost bibliometric tool":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "google scholar as a data source for research assessment")
  Member "about the size of google scholar playing the numbers":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "the state of nlp literature a diachronic analysis of the acl anthology")
  Member "ranking journals could google scholar metrics be an alternative to journal citation reports and scimago journal rank":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "google scholar as a data source for research assessment")
  Member "the new excellence indicator in the world report of the scimago institutions rankings 2011":
    also connected through other hyperedges:
      (none)

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)