@book{8030,
	author = {Birkhoff, Garrett, and Rota, Gian-Carlo,},
	title = {Ordinary differential equations },
	publisher = {Wiley,},
	year = {c1989.},
	address = {New York :},
	edition = {4th ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/description/wiley037/88014231.html}
}