1. R.W. Armstrong, I. Codd, R.M. Douthwaite, and N.J. Petch:Phil. Mag., 1962, vol. 7, p. 45.
2. Y. V. R. K. Prasad, N.M. Madhava, and R.W. Armstrong:Grain Boundaries in Engineering Materials, J. L. Walter, J. H. Westbrook, and D. A. Woodford, eds., Proc. 4th Bolton Landing Conference, Lake George, NY, Claitor’s Publishing Division, Baton Rouge, LA, 1974, p. 67.
3. N.R. Risebrough and E. Teghtsoonian:Canad. J. Phys., 1967, vol. 45, p. 591.
4. F. E. Hauser, P. R. Landon, and J. E. Dom:Trans. AIME, J. of Metals, May 1956, vol. 206, p. 589.
5. K. Okazaki and H. Conrad:Acta Met., 1973, vol. 21, p. 1117.