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	RABIN, M. O., AND SCOTT, D. Finite automata and their decision problems. IBM J, Res. Develop. 8, 2 (Apr. 1959), 114-125.
	2	GLvsov, V.M. Abstract theory of automata. Uapehi Mat. Nauk 16, 5 (101), (1961), 3-62.
	3	FLECK, A.C. AlgebrMe structure of automata. Doctoral Thesis, Michigan State U., East Lansing, 1964.
	4	G. P. Weeg, The Structure of an Automaton and Its Operation-Preserving Transformation Group, Journal of the ACM (JACM), v.9 n.3, p.345-349, July 1962  [doi>10.1145/321127.321131]
	5	---. Structure of tile semi-group associated with automata. Proc. COINS Syrup. On press, Spartan Books, BMtimore, Md.

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