I.G. Farbenind.
Patent: DE582203 , 1930 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 19, p. 3186
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Gen. Aniline Works
Patent: US2016521 , 1931 ;

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Paquin
Angewandte Chemie, 1948 , vol. 60, p. 267,269
Journal of Organic Chemistry, 1949 , vol. 14, p. 189,192

Paquin
Angewandte Chemie, 1949 , vol. 60, p. 267,269
Journal of Organic Chemistry, 1949 , vol. 14, p. 189,192