@book{26371,
	title = {Perturbation Theory and its Applications in Quantum Mechanics.},
	year = {1966.},
	address = {New York,},
	edition = {Ed. by Calv H. Wilcox.},
	url = {http://koha.tu.koszalin.pl/cgi-bin/koha/opac-detail.pl?biblionumber=26371}
}