@book{543606,
	author = {Stephens, Eugene,},
	title = {The elementary theory of operational mathematics,},
	publisher = {McGraw-Hill Book Company, inc.,},
	year = {1937.},
	series = {Electrical engineering texts},
	address = {New York,},
	edition = {1st ed.},
	note = {Series title also at head of t.-p.}
}