@book{6847,
	author = {Derrick, William R. and Grossman, Stanley I.},
	title = {Elementary differential equations /},
	publisher = {Addison-Wesley,},
	year = {c1997.},
	address = {Reading, Mass. :},
	edition = {4th ed.},
	note = {Abridged ed. of: Elementary differential equations with boundary value problems. 4th ed. 1996.}
}