Cahours
Annales de Chimie (Cachan, France), 1853 , vol. <3> 38, p. 87
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Werner
Journal of the Chemical Society, 1914 , vol. 105, p. 932

CIBA
Patent: DE537302 , 1929 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 18, p. 3072
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Horwitz; Rila
Journal of the American Chemical Society, 1958 , vol. 80, p. 431,437