@book{6677,
	author = {Forsythe, W. and Goodall, R. M.},
	title = {Digital control :},
	publisher = {Mcgraw-Hill (Tx),},
	year = {1991.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/0070216002/chopaconline-20}
}