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  1. (1 other version)Classes of Recursively Enumerable Sets and Degrees of Unsolvability.Donald A. Martin - 1966 - Mathematical Logic Quarterly 12 (1):295-310.
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  • (1 other version)Hyperhypersimple alpha-r.e. sets.C. T. Chong - 1976 - Annals of Mathematical Logic 9 (1/2):1.
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  • (2 other versions)Degrees of Unsolvability.Leonard P. Sasso - 1975 - Journal of Symbolic Logic 40 (3):452-453.
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  • Maximal alpha-r.e. sets and their complements.Anne Leggett - 1974 - Annals of Mathematical Logic 6 (3/4):293.
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  • (1 other version)Hyperhypersimple α-r.e. sets.C. T. Chong & M. Lerman - 1976 - Annals of Mathematical Logic 9 (1-2):1-48.
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