@book{74780,
	author = {Kimball, John P.,  and Ruiz Carrión, Francisco,},
	title = {La teoría formal de la gramática /},
	publisher = {Gredos, },
	year = {c1978},
	address = {Madrid :},
	edition = {1a ed.},
	note = {Traducción de: The formal theory of grammar}
}