参考文献

Imp. Chem. Ind. Patent: US1999315 , 1932 ; Full Text Show Details Imp. Chem. Ind. Patent: GB393937 , 1931 ; Full Text Show Details Imp. Chem. Ind. Patent: DE593126 , 1933 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 20, p. 1506