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  1. Theory of Recursive Functions and Effective Computability.Hartley Rogers - 1971 - Journal of Symbolic Logic 36 (1):141-146.
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  • 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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  • Some applications of forcing to hierarchy problems in arithmetic.Peter G. Hinman - 1969 - Mathematical Logic Quarterly 15 (20-22):341-352.
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  • Reducibility orderings: Theories, definability and automorphisms.Anil Nerode & Richard A. Shore - 1980 - Annals of Mathematical Logic 18 (1):61-89.
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