@book{2648,
	author = {LEWIS, HARRY R. and PAPADIMITRIOU, CHRISTOS H.},
	title = {ELEMENTS OF THE THEORY OF COMPUTATION/ },
	publisher = {PRENTICE-HALL},
	year = {1981},
	address = {ENGLEWOOD CLIFFS  ; NEW JERSEY: },
	note = {INCLUYE INDICE.}
}