1. G. C. Kuczynski, Trans. AIME 185, 169 (1949).
2. D. Lynn Johnson and T. M. Clarke, Acta Met. 12, 1173 (1964).
3. M. J. Salkind, F. V. Lenel, and G. S. Ansell, Trans. AIME 233, 39 (1965).
4. M. Herman, Ph.D. Thesis, University of Pennsylvania (1965).
5. M. F. Burr, F. V. Lenel, and G. S. Ansell, Trans. AIME 239, 557 (1967).