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: "approximation algorithms for secondary spectrum auctions"
  Abstract: We study combinatorial auctions for the secondary spectrum market. In this market, short-term licenses shall be given to wireless nodes for communication in their local neighborhood. In contrast to the primary market, channels can be assigned to multiple bidders, provided that the corresponding devices are well separated such that the interference is sufficiently low. Interference conflicts are described in terms of a conflict graph in which the nodes represent the bidders and the edges represent conflicts such that the feasible allocations for a channel correspond to the independent sets in the conflict graph. #R##N#In this paper, we suggest a novel LP formulation for combinatorial auctions with conflict graph using a non-standard graph parameter, the so-called inductive independence number. Taking into account this parameter enables us to bypass the well-known lower bound of \Omega(n^{1-\epsilon}) on the approximability of independent set in general graphs with n nodes (bidders). We achieve significantly better approximation results by showing that interference constraints for wireless networks yield conflict graphs with bounded inductive independence number. #R##N#Our framework covers various established models of wireless communication, e.g., the protocol or the physical model. For the protocol model, we achieve an O(\sqrt{k})-approximation, where k is the number of available channels. For the more realistic physical model, we achieve an O(\sqrt{k} \log^2 n) approximation based on edge-weighted conflict graphs. Combining our approach with the the LP-based framework of Lavi and Swamy, we obtain incentive compatible mechanisms for general bidders with arbitrary valuations on bundles of channels specified in terms of demand oracles.

Connected through hyperedge HE-1 (induced by source paper "fpt algorithms for diverse collections of hitting sets"):
  with members:
    - "diversity in combinatorial optimization"
    - "preparing for the unexpected diversity improves planning resilience in evolutionary algorithms"
    - "discrepancy based evolutionary diversity optimization"
    - "maximum volume subset selection for anchored boxes"
    - "faster deterministic feedback vertex set"
    - "cutset sampling with likelihood weighting"
    - "minimal change integrity maintenance using tuple deletions"

Connected through hyperedge HE-2 (induced by source paper "effective wireless scheduling via hypergraph sketches"):
  with members:
    - "wireless link capacity under shadowing and fading"
    - "the price of local power control in wireless scheduling"
    - "how well can graphs represent wireless interference"
    - "beyond geometry towards fully realistic wireless models"
    - "jamming resistant learning in wireless networks"
    - "online independent set beyond the worst case secretaries prophets and periods"
    - "dynamic packet scheduling in wireless networks"
    - "on the complexity of the minimum latency scheduling problem on the euclidean plane"

Connected through hyperedge HE-3 (induced by source paper "spanning trees with edge conflicts and wireless connectivity"):
  with members:
    - "wireless link capacity under shadowing and fading"
    - "the price of local power control in wireless scheduling"
    - "how well can graphs represent wireless interference"
    - "beyond geometry towards fully realistic wireless models"
    - "online independent set beyond the worst case secretaries prophets and periods"
    - "dynamic packet scheduling in wireless networks"
    - "algorithms for wireless capacity"
    - "graph products revisited tight approximation hardness of induced matching poset dimension and more"

Connected through hyperedge HE-4 (induced by source paper "sas assisted coexistence aware dynamic channel assignment in cbrs band"):
  with members:
    - "a variant of the maximum weight independent set problem"
    - "capacity considerations for secondary networks in tv white space"
    - "adaptive channel allocation spectrum etiquette for cognitive radio networks"

Connected through hyperedge HE-5 (induced by source paper "data dissemination in unified dynamic wireless networks"):
  with members:
    - "leveraging multiple channels in ad hoc networks"
    - "distributed bare bones communication in wireless networks"
    - "a local broadcast layer for the sinr network model"
    - "distributed communication in bare bones wireless networks"
    - "multi message broadcast with abstract mac layers and unreliable links"
    - "randomized broadcast in radio networks with collision detection"
    - "beyond geometry towards fully realistic wireless models"
    - "radio network lower bounds made easy"

Connected through hyperedge HE-6 (induced by source paper "combinatorial auctions with conflict based externalities"):
  with members:
    - "secondary spectrum auctions for symmetric and submodular bidders"
    - "on the power of randomization in algorithmic mechanism design"
    - "sponsored search auctions with markovian users"

Connected through hyperedge HE-7 (induced by source paper "how many political parties should brazil have a data driven method to assess and reduce fragmentation in multi party political systems"):
  with members:
    - "understanding musical diversity via online social media"
    - "you are what you eat and drink identifying cultural boundaries by analyzing food drink habits in foursquare"

Connected through hyperedge HE-8 (induced by source paper "beyond geometry towards fully realistic wireless models"):
  with members:
    - "wireless scheduling algorithms in complex environments"
    - "jamming resistant learning in wireless networks"
    - "distributed deterministic broadcasting in uniform power ad hoc wireless networks"
    - "online independent set beyond the worst case secretaries prophets and periods"
    - "approximation algorithms for wireless link scheduling with flexible data rates"
    - "distributed connectivity of wireless networks"
    - "mlls minimum length link scheduling under physical interference model"
    - "the power of non uniform wireless power"

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.DS(Data Structures and Algorithms)