1. Sosnina, E. I., and Ovsienko, D. E., Fiz. Met. i Metalloved., 3(3) : 527 (1956).
2. Lyuttsau, V. G., and Rovinskii, B. M., Kristallografiya, 8(5) : 742 (1963).
3. Zasimchuk, I. K., and Ovsienko, D. E., Ukr. Fiz. Zh., 9(10) : 1092 (1964).
4. Atwater, H. A., and Chalmers, B., Can. J. Phys., 35 : 208 (1957).
5. Sekerka, R. F., Boiling, G. F., and Tiller, W. A., Can. J. Phys., 38: 883 (1960).