@book{21046,
	author = {Courant, Richard and Hilbert, David},
	title = {Methoden der mathematischen Physick /},
	year = {1968.},
	address = {Berlin,},
	url = {http://koha.tu.koszalin.pl/cgi-bin/koha/opac-detail.pl?biblionumber=21046}
}