1. H. C. Lee and J. Gurland:NSF Hard Materials Research, vol. 4, p. 1, University of Cincinnati, Cincinnati, OH, 1975.
2. H. C. Lee and J. Gurland:Mater. Sci. Eng., 1978, vol. 33, p. 125.
3. W. Bollman:Phil. Mag., 1961, vol. 6, p. 383.
4. J. D. Eshelby, F. C. Frank, and F. R. N. Nabarro:Phil. Mag., 1951, vol. 42, p. 42.
5. A. Cracknell and N. J. Petch:Acta Met., 1955, vol. 3, p. 186.