1. K. Harmon, J. Metals,13, 670 (1961).
2. F. Scott and L. Mudge, Chem. Abstr.,60, 8867 (1964).
3. G. Benedict et al., New Nuclear Materials, Including Non-Metallic Fuels, Proceedings of the Conference (Prague, 1963), Vol. 1, IAEA, Vienna (1963), p. 21.
4. R. Robins, J. Nucl. Mater.,3, 294 (1961).
5. F. Scott and L. Mudge, J. Nucl. Mater.9, 245 (1963).