@book{10669169,
	author = {Duparc, L. and Sigg, H.},
	title = {Les gisements de cuivre de la Syssertskaya-Datcha dans l'Oural},
	year = {1914},
	series = {Труды Геологического Комитета},
	address = {С.Петербургъ},
	note = {Avec 15 figures}
}