@book{9136,
	author = {Gupta, Sushil Das.},
	title = {Control system theory :},
	publisher = {Khanna Publishers,},
	year = {1994.},
	address = {[S.l.] :},
	edition = {4th ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/B0007C2FB8/chopaconline-20}
}