Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Manuel Blum, A Machine-Independent Theory of the Complexity of Recursive Functions, Journal of the ACM (JACM), v.14 n.2, p.322-336, April 1967  [doi>10.1145/321386.321395]
	2	BORODIN, A. Complexity classes of recursive functions and the existence of complexity gaps. ACM Symposium on the Theory of Computing, Marina Del Rey, Calif., 1969, pp. 67-78.
	3	HELM, J.P. On effectively computable operators. Comp. Sci. Dep. Tech. Rep. 49, Purdue U., Lafayette, Ind., 1970.
	4	KLEENE, S.S. Introduction to Metamathematics. Princeton U. Press, Princeton, N.J., 1952.
	5	E. M. McCreight , A. R. Meyer, Classes of computable functions defined by bounds on computation: Preliminary Report, Proceedings of the first annual ACM symposium on Theory of computing, p.79-88, May 05-07, 1969, Marina del Rey, California, United States  [doi>10.1145/800169.805423]
	6	Hartley Rogers, Jr., Theory of recursive functions and effective computability, MIT Press, Cambridge, MA, 1987
	7	ROGERS, H. GSdel numberings of partial recursive functions. J. Symb. Logic 22, 3 (1958), 331-341.
	8	Paul R. Young, Speed-ups by changing the order in which sets are enumerated (Preliminary Version), Proceedings of the first annual ACM symposium on Theory of computing, p.89-92, May 05-07, 1969, Marina del Rey, California, United States  [doi>10.1145/800169.805424]

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