1. G. A. Chadwick:Prog. Mater. Sci., 1963, vol. 12, no. 2, pp. 14347.
2. R. W. Kraft:J. Metals, Feb. 1966, pp. 192–200.
3. H. W. Kerr and W. C. Winegard:J. Metals, May 1966, p. 536.
4. D. J. S. Cooksey and A. Hellawell:J. Inst. Metals, 1967, vol. 95, pp. 183–87.
5. H. W. Kerr, J. A. Bell, and W. C. Winegard:J. Aust. Inst. Metals, 1965, vol. 10, no. 1, pp. 64–69.