1. W. T. LANKFORD, S. C. SNYDER and J. A. BAUSCHER,Trans. ASM. 42 (1950) 1197.
2. R. L. WHITELEY, ibid.52 (1960) 154.
3. K. S. CHAN and D. A. KOSS,Metall. Trans. 14A (1983) 1333.
4. Idem, ibid.14A (1983) 1343.
5. R. W. K. HONEYCOMBE, ?The Plastic Deformation of metals? 2nd edn (Edward Arnold, London, 1984) p.341.