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  1. Categoricity in hyperarithmetical degrees.C. J. Ash - 1987 - Annals of Pure and Applied Logic 34 (1):1-14.
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  • Degrees coded in jumps of orderings.Julia F. Knight - 1986 - Journal of Symbolic Logic 51 (4):1034-1042.
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  • (1 other version)Intrinsically gs;0alpha; relations.E. Barker - 1988 - Annals of Pure and Applied Logic 39 (2):105-130.
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  • (1 other version)Intrinsically< i> gs_;< sup> 0< sub> alpha; relations.E. Barker - 1988 - Annals of Pure and Applied Logic 39 (2):105-130.
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