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  1. A note on the hyperarithmetical hierarchy.H. B. Enderton & Hilary Putnam - 1970 - Journal of Symbolic Logic 35 (3):429-430.
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  • Pseudo-Jump Operators. II: Transfinite Iterations, Hierarchies and Minimal Covers.Carl G. Jockusch & Richard A. Shore - 1984 - Journal of Symbolic Logic 49 (4):1205 - 1236.
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  • Double Jumps of Minimal Degrees.Carl G. Jockusch & David B. Posner - 1978 - Journal of Symbolic Logic 43 (4):715 - 724.
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  • Members of countable π10 classes.Douglas Cenzer, Peter Clote, Rick L. Smith, Robert I. Soare & Stanley S. Wainer - 1986 - Annals of Pure and Applied Logic 31:145-163.
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