@book{13983,
	author = {Courant, Richard, and Hilbert, David,},
	title = {Methods of mathematical physics, volume II : },
	publisher = {Interscience Publishers ;},
	year = {-1989, c1962.},
	series = {Wiley classics library},
	address = {New York :},
	note = {Translation of: Methoden der mathematischen Physik.}
}