@book{7712915,
	author = {Лебедев, В.И.},
	title = {Проблемы геологии},
	publisher = {Изд-во Ленингр. ун-та},
	year = {1974},
	series = {Труды Ленинградского общества естествоиспытателей},
	address = {Ленинград}
}