1. Breckenridge, R. G.: J. Chem. Physics16, 959 (1948);18, 913 (1950).
2. Henvis, B. W., J. W. Davisson andE. Burnstein: Physic. Rev.82, 774 (1951).
3. Seitz, F.: Rev. Mod. Physics18, 396 (1946).
4. Haven, Y.: Rep. of the Confer. on Defects in cristalline Solids. Bristol, p. 261. 1955.
5. Liliard, A. B.: Rep. of the Confer. on Defects in cristalline Solids. Bristol, p. 283. 1955.