Hopcroft, John E. Motwani, Rajeev Ullman, Jeffrey D. Introduction to Automata Theory, Languages, and Computation - New Delhi Pearsom 2014 - p.487 ISBN: 9788131720479 Subjects--Topical Terms: Finite Automata Propefrties of Regular Languages Pushdown Automata Dewey Class. No.: 621.38195 H791