@book{HopUll,
	title = {Introduction to Automata Theory, Languages, and Computation},
	address = {Reading, MA},
	author = {John E. Hopcroft and Jeffrey D. Ullman},
	publisher = {Addison-Wesley},
	year = {1979},
	biburl = {http://www.bibsonomy.org/bibtex/28f8a51b29a0c30983cc3e76645678a53/nlp},
	keywords = {2000 book nlp }
}