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: "densifying the sparse cloud simsaas the need of a synergy among agent directed simulation simsaas and hla"
  Abstract: Modelling & Simulation (M&S) is broadly used in real scenarios where making physical modifications could#R##N##R##N#be highly expensive. With the so-called Simulation Software-as-a-Service (SimSaaS), researchers could take#R##N##R##N#advantage of the huge amount of resource that cloud computing provides. Even so, studying and analysing a#R##N##R##N#problem through simulation may need several simulation tools, hence raising interoperability issues. Having#R##N##R##N#this in mind, IEEE developed a standard for interoperability among simulators named High Level Architecture#R##N##R##N#(HLA). Moreover, the multi-agent system approach has become recognised as a convenient approach for#R##N##R##N#modelling and simulating complex systems. Despite all the recent works and acceptance of these technologies,#R##N##R##N#there is still a great lack of work regarding synergies among them. This paper shows by means of a literature#R##N##R##N#review this lack of work or, in other words, the sparse Cloud SimSaaS. The literature review and the resulting#R##N##R##N#taxonomy are the main contributions of this paper, as they provide a research agenda illustrating future research#R##N##R##N#opportunities and trends.

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.MA(Multiagent Systems)