Madinaveitia Anales de la Real Sociedad Espanola de Fisica y Quimica, 1933 , vol. 31, p. 750,758 Full Text Show Details Kuroda Proceedings of the Imperial Academy (Tokyo), 1939 , vol. 15, p. 226,227 Journal of the Scientific Research Institute, Tokyo, 1951 , vol. 45, p. 166,167 Full Text Show Details Gheorghiu Bulletin de la Societe Chimique de France, 1939 , vol. <5> 6, p. 493,494