@book{6904110,
	author = {Кауфман, Б.Н. and Вдовьева, В.С. and Князев-Левин, М.Д.},
	title = {Керамзит},
	publisher = {13 тип. Мособлполиграфа},
	year = {1937},
	address = {Москва}
}