@book{5743,
	author = {Sherrick, John D.},
	title = {Concepts in systems and signals /},
	publisher = {Prentice Hall,},
	year = {2005.},
	series = {2nd edition.},
	address = {[S.l.] :},
	edition = {2nd ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0131782711/chopaconli}
}