1. Gingerich, K. A., and Efimenko, J., Thermodynamics of Nuclear Materials, 477 (Intern. Atomic Energy Agency, Vienna, 1962).
2. Cater, E. D., Rauh, E. G., and Thorn, R. J., J. Chem. Phys., 35, 608 (1961).
3. Gingerich, K. A., Prog. Rep. AEC Contract, Document No. AT(30-1)-2541 (January 1962).
4. Baskin, Y., Paper presented at the Sixty-fifth Ann. Meet. Ceramic Soc. (April 1963).
5. Baskin, Y., ibid.