1. J. P. Suchet, R. Druille, and J. Lorcher, Izv. Akad. Nauk SSSR, Neorgan. Mat.,2, 796 (1966).
2. M. Chevreton, M. Murat, and E. Bertaut, in: Proprietés Thermodynamiques, Physiques, et Structurales des Derivés Semi-Metalliques, Ed. CNRS, Paris (1967), p. 49.
3. C. F. van Bruggen and F. Jellinek, in: Proprietés Thermodynamiques, Physiques, et Structurales des Derives Semi-Metalliques, Ed. CNRS, Paris (1967), p. 31.
4. F. Gronvold and E. Westrum, Z. Anorg. Allgem. Chem.,328, 272 (1964).
5. A. A. Yanaki, Abstract of Candidate's Dissertation, Institute of Materials Science, Academy of Sciences of the Ukrainian SSR, Kiev (1972).