Ullmann Justus Liebigs Annalen der Chemie, 1904 , vol. 332, p. 101 Full Text Show Details Deletra; Ullmann Chem. Zentralbl., 1904 , vol. 75, # I p. 1570 Full Text Show Details Mazzara; Leonardi Gazzetta Chimica Italiana, 1891 , vol. 21 II, p. 380 Full Text Show Details Anderson; Campbell Journal of the Chemical Society, 1950 , p. 2904