@book{232,
	author = {Ayres, Frank JR. and Ault, J C.},
	title = {Theory and problems of differential equations in si metric units /},
	publisher = {McGraw-Hill,},
	year = {c2008-09.},
	series = {Schaum's outline of Math},
	address = {Singapore:},
	edition = {1st ed.}
}