@book{4957,
	author = {Roark, Raymond J. and Young, Warren C.},
	title = {Roark's formulas for stress and strain /},
	publisher = {McGraw-Hill,},
	year = {c1989.},
	series = {General Engineering},
	address = {New York :},
	edition = {6th ed.},
	note = {Originally published under title: Formulas for stress and strain.}
}