Ginsburg, Seymour, Algebraic and automata-theoretic properties of formal languages / Seymour Ginsburg. - Amsterdam : North-Holland Pub., 1975. - xii,313 p. ; - Fundamental studies in computer science ; v. 2 . ISBN: 0720425069 Subjects--Topical Terms: Formal languages. Dewey Class. No.: 511.30285 / Al