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  1. A degree-theoretic definition of the ramified analytical hierarchy.Carl G. Jockusch & Stephen G. Simpson - 1976 - Annals of Mathematical Logic 10 (1):1-32.
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  • Model-theoretic complexity of automatic structures.Bakhadyr Khoussainov & Mia Minnes - 2010 - Annals of Pure and Applied Logic 161 (3):416-426.
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  • On the Π1 1 -separation principle.Antonio Montalbán - 2008 - Mathematical Logic Quarterly 54 (6):563-578.
    We study the proof-theoretic strength of the Π11-separation axiom scheme, and we show that Π11-separation lies strictly in between the Δ11-comprehension and Σ11-choice axiom schemes over RCA0.
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  • An admissible generalization of a theorem on countable ¹ 1 sets of reals with applications.M. Makkai - 1977 - Annals of Mathematical Logic 11 (1):1.
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