@book{54211,
	author = {Ayres, Frank, and Ault, J. C.},
	title = {Schaum's outline of theory and problems of differential equations in SI metric units /},
	publisher = {McGraw-Hill,},
	year = {1976.},
	series = {Schaum's outline series.},
	address = {Singapore :},
	edition = {1st ed.}
}