1. Hughes, N. A., and Caley, J., J. Nuclear Materials, 10, 60 (1963).
2. Robertshaw, F. C., et al., A.S.T.M. Spec. Tech. Pub. No. 341, 372 (1963).
3. Hinkle, N. E., A.S.T.M. Spec. Tech. Pub. No. 341, 344 (1963).
4. Harries, D. P., et al., U.N. Geneva Conf., 28/P/162 (1964).
5. Chenock, W., et al., U.N. Geneva Conf., 28/P/255 (1964).