1. R. E. Villagrana, J. L. Kaae, J. R. Ellis, and P, K. Gantzel:Metall. Trans. A, 1978, vol. 9A, p. 927.
2. J. Orr:Proceedings of the Petten International Conference on Alloy 800, W. Betteridge, R. Krefeld, H. Krockel, S. J. Lloyd, M. Van de Voorde, and C. Vivante, eds., North-Holland Publishing Co., 1978, p. 25.
3. L. D. Thompson: private communication, General Atomic Co., San Diego, CA, 1978.
4. H. Nahm and J. Moteff:Metall. Trans. A, 1976, vol. 7A, p. 1473.
5. B. Tompkins:Philos. Mag., 1968, vol. 18, p. 1041.