1. 1) E. W. Hart, C. Y. Li, H. Yamada and G. L. Wire: Constitutive Equations in Plasticity, ed. by A. S. Argon, MIT Press, Cambridge, (1975), p. 149.
2. 2) E. W. Hart and H. D. Solomon: Acta Met., 21 (1973), 295.
3. 3) H. Yamada and C. Y. Li: Acta Met., 22 (1974), 249.
4. 4) G. L. Wire, H. Yamada and C. Y. Li: Acta Met., 22 (1974), 505.
5. 5) E. W. Hart: Rate Processes in Plastic Deformation of Materials, ed. by J. C. M. Li and A. K. Mukherjee, ASM (1975), p. 284.