Comp. Franc. Mat. Col. Patent: US2858301 , 1952 ; Full Text Show Details Comp. Franc. Mat. Col. Patent: DE959553 , 1952 ; Full Text Show Details Bechli Zhurnal Obshchei Khimii, 1957 , vol. 27, p. 698,700, 702; engl. Ausg. S. 769, 770, 771