Takasago International Corporation
Patent: US6228547 B1, 2001 ;

Gaess; Elsaesser
Chemische Berichte, 1893 , vol. 26, p. 976
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Ruhemann
Chemische Berichte, 1881 , vol. 14, p. 2655

Fischer,O.; Schuette
Chemische Berichte, 1893 , vol. 26, p. 3086
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Gaess; Elsaesser
Chemische Berichte, 1893 , vol. 26, p. 976
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Dahl and Co.
Patent: DE74782 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 3, p. 518