参考文献

Eastman Kodak Co. Patent: US2185343 , 1937 ; Full Text Show Details ICI Patent: DE621404 , 1930 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 21, p. 809 Full Text Show Details Eastman Kodak Co. Patent: US2307916 , 1938 ;