@book{1650,
	author = {Zill, Dennis G., and Zill, Dennis G.,},
	title = {A first course in differential equations with modeling applications /},
	publisher = {Brooks/Cole Thomson Learning,},
	year = {c2001.},
	address = {Pacific Grove, CA :},
	edition = {7th ed.},
	note = {Rev. ed. of: A first course in differential equations. 5th ed. c1993.}
}