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== References ==
* K. Ambos-Spies and P. Fejer, 2006. "[http://www.cs.umb.edu/~fejer/articles/History_of_Degrees.pdf Degrees of Unsolvability]." Unpublished preprint.
* P. Odifreddi, 1989. ''Classical Recursion Theory'', North-Holland.
* P. Odifreddi, 1999. ''Classical Recursion Theory, Volume II'', Elsevier.
*E. Post, 1944, "Recursively enumerable sets of positive integers and their decision problems", ''Bulletin of the American Mathematical Society'', volume 50, pages 284–316.
* H. Rogers, Jr., 1967. ''The Theory of Recursive Functions and Effective Computability'', second edition 1987, MIT Press.
* G Sacks, 1990. ''Higher Recursion Theory'', Springer-Verlag.
[[Category:Computability theory]]
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