Roehm and Haas Co.
Patent: US2008337 , 1932 ;

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Roehm and Haas Co.
Patent: DE666134 , 1933 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 25, p. 137

Niederl; Natelson; Beekman
Journal of the American Chemical Society, 1933 , vol. 55, p. 2571,2574
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Roehm and Haas Co.
Patent: US2008032 , 1933 ;

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Roehm and Haas Co.
Patent: DE657724 , 1934 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 24, p. 172
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Niederl; Sieger; Stirn
Journal of Organic Chemistry, 1948 , vol. 13, p. 584,587
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Roehm and Haas Co.
Patent: US2008337 , 1932 ;