1. Myssowsky, L., and Tschischow, P., Z. Phys., 44, H.6/9, 408 (1927). Deisenroth-Myssowsky, M., Trav. Inst. du Radium de l'Etat (URSS.), 1 (1930). Idanoff, A., Trav. l'Inst. du Radium de l'Etat (URSS), 2 (1933). Jdanoff, A., J. Phys. et le Rad., 6, 233 (1935).
2. Jdanoff, A., C.R. Acad. USSR, 20, 641 (1938). Jdanoff, A., C.R. Acad. USSR, in the Press. Filippow, A., Jdanow, A., and Gurewich, I., C.R. Acad. USSR, 18, 181 (1938). Blau, M., and Wambacher, H., NATURE, 140, 585 (1937). Blau, M., and Wambacher, H., Mitt. d. Inst. f. Radiumforsch., No. 409 (1937). Wambacher, H., Phys. Z., No. 23/24, 883 (1938). Schopper, E. M., and Schopper, E., Phys. Z., No. 1, 22 (1939).