@book{478417,
	author = {Zill, Dennis G., and Cullen, Michael R.},
	title = {Differential equations with boundary-value problems },
	publisher = {Brooks/Cole, Cengage Learning,},
	year = {c2009.},
	address = {Belmont, CA :},
	edition = {7th ed. },
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/toc/fy0805/2008924835.html}
}