Harris Proceedings of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences, 1939 , vol. 173, p. 134,138 Full Text Show Details Medwedew; Alekseewa Zhurnal Obshchei Khimii, 1931 , vol. 1, p. 1200,1207 Chemische Berichte, 1932 , vol. 65, p. 137,139, 141