@book{4221,
	author = {Gopal, R.},
	title = {Problems and solutions in analog systems /},
	publisher = {CBS Publishers & Distributors,},
	year = {2009.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/812391363X/chopaconline-20}
}