Voeltzkow
Chemische Berichte, 1880 , vol. 13, p. 1580
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Liebermann
Justus Liebigs Annalen der Chemie, 1881 , vol. 207, p. 140,141
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Claus; Voeltzkow
Chemische Berichte, 1881 , vol. 14, p. 445
v. Janson
Chem. Zentralbl., 1906 , vol. 77, # II p. 1694
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v. Janson
Patent: DE175586 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 8, p. 392