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Higher Recursion Theory by Gerald E. Sacks Degrees of Unsolvability by Gerald E. Sacks Saturated model theory by Gerald E. Sacks MATHEMATICAL LOGIC IN THE 20TH CENTURY by Gerald E. Sacks Selected Logic Papers by Gerald E. Sacks The Big Shrink by Gerald E. Sacks Higher Recursion Theory by Gerald E. Sacks Higher Recursion Theory by Gerald E. Sacks Degrees of Unsolvability, Second Edition by Gerald E. Sacks Degrees Of Unsolvability by Gerald E. Sacks


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