Introduction to automata theory, languages, and computation / John E. Hopcroft, Jeffrey D. Ullman. Hopcroft, John E., 1939- Ullman, Jeffrey D., 1942- joint author. Machine theory. Formal languages. Computational complexity. QA267 .H56 005.131 19 HOI Includes index. Bibliography: p. 396-410. New Delhi : Narosa, c1979. c1979. 1979 Text xii, 418 p. : eng