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: "the effect of the indonesian higher education evaluation system on conference proceedings publications"
  Abstract: Indonesia has exhibited a unique pattern of conference proceedings publishing that was distinct from global and regional norms. Conference proceedings are now an integral part of the major citation databases, and this study examined their progressive coverage in the context of academic career advancement and Indonesian government policy. The results of analyses in Web of Science (WoS), Scopus and to a lesser extent, Dimensions showed an increase in the proportion of conference proceedings far in excess of global norms and not seen in any other South East Asian country. In the conference series containing most Indonesian proceedings papers, there was a recent increase in representation from Indonesia and an increase in the proportion of those conferences hosted in Indonesia. Local policy documents and guidelines from 2012 and 2014 appeared to encourage academics to increase research outputs in high impact internationally indexed sources but did not make any distinction between document types. The conclusion suggests that scholars might have found advantage in advancing through the hierarchy of academia through publishing conference papers that were quicker and easier to publish than journal articles. The study is important to policy makers in the area of research evaluation because it highlights potential changes in academic publishing behaviour by those being assessed.

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)