References
^ Martin Davis (1994). 9780122063824, Academic Press, Harcourt, Brace & Company. ISBN 9780122063824 (revised Dec 2013)^ Elaine J. Weyuker, Ron Sigal, Martin D. DavisComputability, Complexity, and Languages : Fundamentals of Theoretical Computer Science by Elaine J. Weyuker, Ron Sigal and Martin D. Davis (1994, Hardcover, Revised) ISBN 9780122063824 (revised Feb 2015)
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