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  1. Gerald E. Sacks. The recursively enumerable degrees are dense. Annals of mathematics, ser. 2 vol. 80 (1964), pp. 300–312. [REVIEW]Gerald E. Sacks - 1969 - Journal of Symbolic Logic 34 (2):294-295.
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  • On the Degrees Less than 0'.Gerald E. Sacks - 1964 - Journal of Symbolic Logic 29 (1):60-60.
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  • How Enumeration Reducibility Yields Extended Harrington Non-Splitting.Mariya I. Soskova & S. Barry Cooper - 2008 - Journal of Symbolic Logic 73 (2):634 - 655.
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  • Partial degrees and the density problem. Part 2: The enumeration degrees of the ∑2 sets are dense.S. B. Cooper - 1984 - Journal of Symbolic Logic 49 (2):503 - 513.
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  • Then-rea enumeration degrees are dense.Alistair H. Lachlan & Richard A. Shore - 1992 - Archive for Mathematical Logic 31 (4):277-285.
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  • A recursively enumerable degree which will not split over all lesser ones.Alistair H. Lachlan - 1976 - Annals of Mathematical Logic 9 (4):307.
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