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2. W. R. Cannon andO. D. Sherby,Metall. Trans. 1 (1970) 1030.
3. F. A. Mohamed andT. G. Langdon,Acta Metall. 22 (1974) 779.
4. J. Weertman, in ?Rate Processes in Plastic Deformation of Materials?, edited by J. C. M. Li and A. K. Mukherjee (ASM, Metal Park, Ohio, 1975) p. 315.
5. O. D. Sherby andC. M. Young, in ?Rate Processes in Plastic Deformation of Materials?, edited by J. C. M. Li and A. K. Mukherjee (ASM, Metal Park, Ohio, 1975) p. 497.