參考文獻:
I.G. Farbenind. Patent: DE618045 , 1933 Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 22, p. 1154 Full Text Show Details Gen. Aniline Works Patent: US2128514 , 1934
參考文獻:
Barnett Matthews Journal of the Chemical Society, 1923 , vol. 123, p. 2556 Full Text Show Details Eckert Tomaschek Monatshefte fuer Chemie, 1918 , vol. 39, p. 862