1. R. W. Armstrong:Advan. Mater. Res., 1970, vol. 4, p. 101.
2. W. B. Morrison:Trans. ASM, 1966, vol. 59, p. 824.
3. R. A. Grange:Trans. ASM, 1966, vol. 59, p. 26.
4. W. B. Morrison and R. L. Miller:Ultrafine-Grain Metals, Proc. 16th Sagamore Conf., p. 183, Syracuse Univ. Press, 1970.
5. R. W. Armstrong:Ultrafine-Grain Metals, Proc. 16th Sagamore Conf., p. 1, Syracuse Univ. Press, 1970.