Journal fuer Praktische Chemie (Leipzig), , vol. <2>123, p. 164,166 Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, , vol. 61, p. 1936,1938 Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, , vol. 61, p. 1938 166