Soper et al. Journal of the American Chemical Society, 1948 , vol. 70, p. 2849,2851 Full Text Show Details Holmberg Journal fuer Praktische Chemie (Leipzig), 1934 , vol. <2> 141, p. 93,96 Arkiv foer Kemi, 1937 , vol. 12 A, # 14 p. 3,4