@book{7121,
	author = {Barton, Gabriel.},
	title = {Elements of Green's functions and propagation :},
	publisher = {Clarendon Press ;},
	year = {1989.},
	address = {Oxford :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0606/88005224-d.html}
}