@book{6520,
	author = {brenner, j.l. and Brenner, J. L.},
	title = {Problems in differential equations /},
	publisher = {Dover Publications, Inc.,},
	year = {2013.},
	address = {Mineola, New York :},
	note = {Originally published: San Francisco : W.H. Freeman, 1963.},
	url = {http://www.loc.gov/catdir/enhancements/fy1408/2013014718-d.html}
}