Hoffmann-La Roche
Patent: US2072829 , 1936 ;

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Hoffmann-La Roche
Patent: DE655530 , 1936 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 24, p. 353

Miller et al.
Journal of the American Chemical Society, 1936 , vol. 58, p. 1090
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Parke, Davis and Co.
Patent: US2153712 , 1936 ;

Lund
Danske Vid. Selsk. Mat. fys. Medd., 1935 , vol. 13, # 13 p. 10