Degrees joining to 0′
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[1] Donald A. Martin,et al. The Degrees of Hyperimmune Sets , 1968 .
[2] C. Jockusch. Simple Proofs of Some Theorems on High Degrees of Unsolvability , 1977, Canadian Journal of Mathematics.
[3] C. Jockusch. Degrees in Which the Recursive Sets are Uniformly Recursive , 1972, Canadian Journal of Mathematics.