Steinkopf; Smie Chemische Berichte, 1926 , vol. 59, p. 1463 Show Details Steinkopf; Dudek Chemische Berichte, 1929 , vol. 62, p. 2496 Show Details Blicke; Powers Journal of the American Chemical Society, 1932 , vol. 54, p. 3354,3357