Danckwortt Archiv der Pharmazie (Weinheim, Germany), 1890 , vol. 228, p. 581 Full Text Show Details Beckett; Wright Journal of the Chemical Society, 1875 , vol. 28, p. 23,24 Full Text Show Details Merck E. Merck's Jahresberichte, 1898 , p. 20 Archiv der Pharmazie (Weinheim, Germany), 1899 , vol. 237, p. 220