@book{11885,
	author = {PETROV, Ju. P.},
	title = {Variational metods in optimum control theory /},
	publisher = {Academic Press,},
	year = {1968.},
	series = {Mathematics in Science and Engineering ;},
	address = {New York :},
	url = {http://koha.tu.koszalin.pl/cgi-bin/koha/opac-detail.pl?biblionumber=11885}
}