1. J. D. EMBURY, “Strengthening Methods in Crystals”, edited by A. Kelley and R. B. Nicholson (Wiley, London, 1971) p. 331.
2. R. B. NICHOLSON,ibid., p. 535.
3. P. K. SENGUPTA and J. REZEK, in press.
4. P. K. SENGUPTA, A. MINARDI, O. T. WOO and J. REZEK,Can. Metall. Q. 14 (1975) 53.
5. J. G. MORRIS,Mater. Sci. Engng 3 (1968/69) 220.