Auerbach
Journal of the Chemical Society, 1879 , vol. 35, p. 800
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Graebe
Chemische Berichte, 1878 , vol. 11, p. 1646
Justus Liebigs Annalen der Chemie, 1880 , vol. 201, p. 335
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Prud'homme
Bulletin de la Societe Chimique de France, 1877 , vol. <2>28, p. 62
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Schultz
Farbstofftabellen,5.Aufl.