References
[C] Cooper, S.B.: Minimal degrees and the jump operator. JSL.38, 249–271 (1973)
[F] Friedberg, R.M.: A criterion for completeness of degrees of unsolvability. JSL.22, 159–160 (1957)
[Le] Lerman, M.: Degrees of unsolvability. Perspectives in mathematical logic. Ω-series. Berlin Heidelberg New York: Springer 1983
[Sh] Shoenfield, J.R.: On degrees of unsolvability. Ann. of Math.69, 586–592 (1959)
[So] Soare, I.R.: Recursively enumerable sets and degrees, perspectives in mathematical logic. Ω-series. Berlin Heidelberg New York: Springer 1987
[Z] Zheng, X.: The rhombus classes of degrees of unsolvability (II), jump classes and chain properties. J. of Nanjing University Mathematical Biquarterly7, 13–25 (1990)
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Zheng, X. The rhombus classes of degrees of unsolvability (I), The jump properties. Arch Math Logic 33, 1–12 (1994). https://doi.org/10.1007/BF01275466
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DOI: https://doi.org/10.1007/BF01275466