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	Seymour Ginsburg , H. Gordon Rice, Two Families of Languages Related to ALGOL, Journal of the ACM (JACM), v.9 n.3, p.350-371, July 1962  [doi>10.1145/321127.321132]
	2	Seymour Ginsburg , G. F. Rose, Operations Which Preserve Definability in Languages, Journal of the ACM (JACM), v.10 n.2, p.175-195, April 1963  [doi>10.1145/321160.321167]
	3	Seymour Ginsburg , Gene F. Rose, Some Recursively Unsolvable Problems in ALGOL-Like Languages, Journal of the ACM (JACM), v.10 n.1, p.29-47, Jan. 1963  [doi>10.1145/321150.321153]
	4	KoNIG, D. Theorie Der Endlichen und Unencltichen Graphen. CheIsea Publishing Co, New York, 1950.
	5	RABINs, M., AND SCOTT, D. Finite automata and their decision problems. IBM Y. research Devsl. 3 (1959), 115-125.
	6	YNGVE, V. A model and tm hypothesis for language structure. Proc. Am. Philos. Soc. lO4 (1960), 444-466.
	7	---- Comupter programs for translation. Sci, Am. 206' (June 1962), 68-76.

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