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: "oracle pushdown automata nondeterministic reducibilities and the cfl hierarchy over the family of context free languages"
  Abstract: To expand a fundamental theory of context-free languages, we equip nondeterministic one-way pushdown automata with additional oracle mechanisms, which naturally induce various nondeterministic reducibilities among formal languages. As a natural restriction of NP-reducibility, we introduce a notion of many-one CFL reducibility and conduct a ground work to formulate a coherent framework for further expositions. Two more powerful reducibilities--bounded truth-table and Turing CFL-reducibilities--are also discussed in comparison. The Turing CFL-reducibility, in particular, helps us introduce an exquisite hierarchy, called the CFL hierarchy, built over the family CFL of context-free languages. For each level of this hierarchy, its basic structural properties are proven and three alternative characterizations are presented. The second level is not included in NC(2) unless NP= NC(2). The first and second levels of the hierarchy are different. The rest of the hierarchy (more strongly, the Boolean hierarchy built over each level of the hierarchy) is also infinite unless the polynomial hierarchy over NP collapses. This follows from a characterization of the Boolean hierarchy over the k-th level of the polynomial hierarchy in terms of the Boolean hierarchy over the k+1st level of the CFL hierarchy using log-space many-one reductions. Similarly, the complexity class Theta(k) is related to the closure of the k-th level of the CFL hierarchy under log-space truth-table reductions. We also argue that the CFL hierarchy coincides with a hierarchy over CFL built by application of many-one CFL-reductions. We show that BPCFL--a bounded-error probabilistic version of CFL--is not included in CFL even in the presence of advice. Employing a known circuit lower bound and a switching lemma, we exhibit a relativized world where BPCFL is not located within the second level of the CFL hierarchy.

Connected through hyperedge HE-1 (induced by source paper "nonuniform families of polynomial size quantum finite automata and quantum logarithmic space computation with polynomial size advice"):
  with members:
    - "state complexity characterizations of parameterized degree bounded graph connectivity sub linear space computation and the linear space hypothesis"
    - "the 2cnf boolean formula satisfiability problem and the linear space hypothesis"
    - "complexity bounds of constant space quantum computation"
    - "automata and quantum computing"
    - "classical automata on promise problems"
    - "quantum computation with write only memory"
    - "unbounded error quantum computation with small space bounds"
    - "the roles of advice to one tape linear time turing machines and finite automata"

Connected through hyperedge HE-2 (induced by source paper "not all multi valued partial cfl functions are refined by single valued functions"):
  with members:
    - "structural complexity of multi valued partial functions computed by nondeterministic pushdown automata"
    - "immunity and pseudorandomness of context free languages"
    - "pseudorandom generators against advised context free languages"
    - "swapping lemmas for regular and context free languages"
    - "theory of one tape linear time turing machines"

Connected through hyperedge HE-3 (induced by source paper "structural complexity of multi valued partial functions computed by nondeterministic pushdown automata"):
  with members:
    - "immunity and pseudorandomness of context free languages"
    - "the roles of advice to one tape linear time turing machines and finite automata"
    - "multi head finite automata characterizations concepts and open problems"
    - "pseudorandom generators against advised context free languages"
    - "swapping lemmas for regular and context free languages"
    - "theory of one tape linear time turing machines"

Connected through hyperedge HE-4 (induced by source paper "pseudorandom generators against advised context free languages"):
  with members:
    - "structural complexity of multi valued partial functions computed by nondeterministic pushdown automata"
    - "immunity and pseudorandomness of context free languages"
    - "the roles of advice to one tape linear time turing machines and finite automata"
    - "swapping lemmas for regular and context free languages"
    - "theory of one tape linear time turing machines"

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.FL(Formal Languages and Automata Theory)