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  1. Degrees of Unsolvability.Leonard P. Sasso - 1975 - Journal of Symbolic Logic 40 (3):452-453.
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  • On $\Pi^0_1$ classes and their ranked points.Rod Downey - 1991 - Notre Dame Journal of Formal Logic 32 (4):499-512.
  • Arithmetical Sacks Forcing.Rod Downey & Liang Yu - 2006 - Archive for Mathematical Logic 45 (6):715-720.
    We answer a question of Jockusch by constructing a hyperimmune-free minimal degree below a 1-generic one. To do this we introduce a new forcing notion called arithmetical Sacks forcing. Some other applications are presented.
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  • Minimal degrees recursive in 1-generic degrees.C. T. Chong & R. G. Downey - 1990 - Annals of Pure and Applied Logic 48 (3):215-225.
  • Degrees of Unsolvability.Joseph R. Shoenfield - 1975 - Studia Logica 34 (3):284-288.
     
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