Fritzmann, E. Ch. Z. Anorg. Chem., 1912 , vol. 73, p. 239 - 255 Full Text Show Details Fritzmann, E. Ch. Izv. Plat., 1926 , vol. 4, p. 182 - 202 Full Text Show Details Gmelin Handbook: Pt: MVol.D, 152, page 337 - 338