@book{49718,
	author = {Courant, Richard. and Hilbert, D.},
	title = {Methoden der Mathematischen physik / },
	editor = {Spamersche Buchdruckerei)},
	publisher = {Julius Springer, },
	year = {1931 (},
	address = {Berlin : },
	edition = {2. verb. Aufl.}
}