Journal of the Chemical Society, , vol. 99, p. 719 Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, , vol. 44, p. 1439,1442 Journal fuer Praktische Chemie (Leipzig), , vol. <2>84, p. 748 Chem. Zentralbl., , vol. 84, # I p. 1581