1. J. I. Federer and T. S. Lundy: Trans. TMS-AIME, 1963, vol. 227, p. 592.
2. G. B. Gibbs, D. Graham, and D. H. Tomlin:Phil. Mag., 1963, vol. 8, p. 1269.
3. R. F. Peart:J. Phys. Chem. Solids, 1965, vol. 26, p. 1853.
4. G. V. Kidson and R. Ross:Radio Isotopes in Scientific Research, p. 185, Pergamon Press, 1958.
5. C. Zener:Imperfections in Nearly Perfect Crystals, W. Shockleyet al, eds., p. 289, John Wiley, 1959.