@book{6900,
	author = {Zill, Dennis G.},
	title = {Differential Equations with Computer Lab Experiments },
	publisher = {Brooks Cole,},
	year = {1998.},
	address = {Boston},
	edition = {2nd ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0534351735/chopaconline-20}
}