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Dekker, J.C.E.: Infinite series of isols. Proceedings of the Symposium on Recursive Function Theory, p. 77–96. Providence: Amer. Math. Soc. 1962.
— andJ. Myhill. Recursive equivalence types. Univ. California Publ. Math. (N.S.)3, 67–214 (1960).
Sansone, F.J.: Combinatorial functions and regressive isols Pacific J. Math.13, 703–707 (1963).
—: A mapping of regressive isols. Illinois J. Math.9, 726–735 (1965).
This paper was written while the author was a student ofJ. C. E. Dekker at Rutgers, The State University.