1. J. Richard and I. C. H. Hughes, BCIRA J. Res. Develop.
9 (1961) 1, 11.
2. R. W. Heine and J. E. Barton, Trans. AFS.
85 (1977) 379.
3. G. F. L. Powell, Metals Forum, 3 (1980) 37.
4. H. Morrogh and P. Tutsch, JISI
176 (1954) 382.
5. B. Zhao and E. W. Langer, Scand. J. Metall.
11 (1982) 287.