参考文献

Imp. Chem. Ind. Patent: US1873290 , 1929 ; Full Text Show Details Imp. Chem. Ind. Patent: DE558069 , 1929 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 19, p. 631 Full Text Show Details Imp. Chem. Ind. Patent: GB325933 , 1929 ;