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: "on the shoulders of giants the growing impact of older articles"
  Abstract: In this paper, we examine the evolution of the impact of older scholarly articles. We attempt to answer four questions. First, how often are older articles cited and how has this changed over time. Second, how does the impact of older articles vary across different research fields. Third, is the change in the impact of older articles accelerating or slowing down. Fourth, are these trends different for much older articles. #R##N#To answer these questions, we studied citations from articles published in 1990-2013. We computed the fraction of citations to older articles from articles published each year as the measure of impact. We considered articles that were published at least 10 years before the citing article as older articles. We computed these numbers for 261 subject categories and 9 broad areas of research. Finally, we repeated the computation for two other definitions of older articles, 15 years and older and 20 years and older. #R##N#There are three conclusions from our study. First, the impact of older articles has grown substantially over 1990-2013. In 2013, 36% of citations were to articles that are at least 10 years old; this fraction has grown 28% since 1990. The fraction of older citations increased over 1990-2013 for 7 out of 9 broad areas and 231 out of 261 subject categories. Second, the increase over the second half (2002-2013) was double the increase in the first half (1990-2001). #R##N#Third, the trend of a growing impact of older articles also holds for even older articles. In 2013, 21% of citations were to articles >= 15 years old with an increase of 30% since 1990 and 13% of citations were to articles >= 20 years old with an increase of 36%. #R##N#Now that finding and reading relevant older articles is about as easy as finding and reading recently published articles, significant advances aren't getting lost on the shelves and are influencing work worldwide for years after.

Connected through hyperedge HE-1 (induced by source paper "relay linking models for prominence and obsolescence in evolving networks"):
  with members:
    - "mean field inference of hawkes point processes"
    - "coevolve a joint point process model for information diffusion and network co evolution"
    - "quantifying long term scientific impact"
    - "shuffling a stacked deck the case for partially randomized ranking of search engine results"

Connected through hyperedge HE-2 (induced by source paper "publication boost in web of science journals and its effect on citation distributions"):
  with members:
    - "predicting the long term citation impact of recent publications"
    - "quantifying long term scientific impact"
    - "rescaling citations of publications in physics"

Connected through hyperedge HE-3 (induced by source paper "back to the past on the shoulders of an academic search engine giant"):
  with members:
    - "cited half life of the journal literature"
    - "methods for estimating the size of google scholar"
    - "the silent fading of an academic search engine the case of microsoft academic search"
    - "does google scholar contain all highly cited documents 1950 2013"
    - "google scholar metrics evolution an analysis according to languages"

Connected through hyperedge HE-4 (induced by source paper "the memory of science inflation myopia and the knowledge network"):
  with members:
    - "megajournal mismanagement manuscript decision bias and anomalous editor activity at plos one"
    - "field normalization of scientometric indicators"
    - "a review of the literature on citation impact indicators"
    - "rise of the rest the growing impact of non elite journals"
    - "quantifying long term scientific impact"

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)