Cowie; Gibson Journal of the Chemical Society, 1934 , p. 46 Full Text Show Details Shriner; Struck; Jorison Journal of the American Chemical Society, 1930 , vol. 52, p. 2060,2067 Full Text Show Details Steinkopf; Jaeger Journal fuer Praktische Chemie (Leipzig), 1930 , vol. <2>128, p. 63,79