Bruson
Journal of the American Chemical Society, 1936 , vol. 58, p. 1741,1744
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Roehm and Haas Co.
Patent: US2114122 , 1935 ;

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Roehm and Haas Co.
Patent: DE674968 , 1936 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 24, p. 1432