@book{57617,
	author = {Coddington, Earl A.},
	title = {An introduction to ordinary differential equations /},
	publisher = {Dover Publications Inc.,},
	year = {1961, 1989.},
	address = {New York :},
	note = {Reprint originally published: Englewood Cliffs, N.J. : Prentice-Hall, 1961, Includes index and bibliography: p.}
}