C. E. M. Yates. Recursively enumerable degrees and the degrees less than 0(1). Sets, models and recursion theory, Proceedings of the Summer School in Mathematical Logic and Tenth Logic Colloquium, Leicester, August-September 1965, edited by John N. Crossley, Studies in logic and the foundations of mathematics, North-Holland Publishing Company, Amsterdam, and Humanities Press, New York, 1967, pp. 264–271.
1970 ◽
Vol 35
(4)
◽
pp. 589-589