@book{6235,
	author = {Williamson, Richard E. and Trotter, Hale F.,},
	title = {Multivariable mathematics :},
	publisher = {Prentice-Hall,},
	year = {c1979.},
	address = {Englewood Cliffs, N.J. :},
	edition = {2d ed.},
	note = {Includes index.}
}