参考文献

Gen. Aniline Works Patent: US2086029 , 1935 ; Full Text Show Details Gen. Aniline Works Patent: FR800346 , 1936 ; Full Text Show Details I.G. Farbenind. Patent: DE637318 , 1935 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 23, p. 190