@book{6768,
	author = {Martin, William Ted, and Reissner, Eric.},
	title = {Elementary differential equations /},
	publisher = {Dover Publications,},
	year = {1986, c1961.},
	address = {New York :},
	note = {Reprint. Originally published: 2nd ed. Reading, Mass. : Addison-Wesley Pub. Co., 1961. (Addison-Wesley series in mathematics)}
}