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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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  • 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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  • Intrinsically gs;0alpha; relations.E. Barker - 1988 - Annals of Pure and Applied Logic 39 (2):105-130.
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  • Stability of recursive structures in arithmetical degrees.C. J. Ash - 1986 - Annals of Pure and Applied Logic 32:113-135.
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  • Pairs of recursive structures.C. J. Ash & J. F. Knight - 1990 - Annals of Pure and Applied Logic 46 (3):211-234.
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