MathSciNet bibliographic data MR2172411 68Q05 (03D05 68Q15) Deolalikar, Vinay; Hamkins, Joel David; Schindler, Ralf ${\rm P}\neq{\rm NP}\cap$${\rm P}\neq{\rm NP}\cap$ co-NP for infinite time Turing machines. J. Logic Comput. 15 (2005), no. 5, 577–592. Article

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