@book{128057,
	author = {Zill, Dennis G.,},
	title = {Differential equations with boundary-value problems /},
	publisher = {Brooks/Cole, Cengage Learning,},
	year = {2013},
	address = {Boston, MA :},
	edition = {8th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1303/2011944305-b.html}
}