Gen. Aniline Works
Patent: US2086704 , 1934 ;

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I.G. Farbenind.
Patent: DE614196 , 1933 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 22, p. 1126,1130
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Krepelka; Stefec
Collection of Czechoslovak Chemical Communications, 1937 , vol. 9, p. 29,31