Bilhuber Inc.
Patent: AT134561 ;

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Bilhuber Inc.
Patent: US1972450 , 1931 ;

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Knoll A.G.
Patent: CH163535 , 1932 ;

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Knoll A.G.
Patent: DE617536 , 1931 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 21, p. 680,682
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Knoll A.G.
Patent: DE617879 , 1932 ;

Taylor,W.G.; Coutts,R.
Canadian Journal of Chemistry, 1979 , vol. 57, p. 2103 - 2107

Knoll A.G.
Patent: DE617596 , 1931 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 21, p. 684
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Knoll A.G.
Patent: CH166214 , 1932 ;

Knoll A.G.
Patent: DE617596 , 1931 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 21, p. 684

Taylor,W.G.; Coutts,R.
Canadian Journal of Chemistry, 1979 , vol. 57, p. 2103 - 2107