1. A. Seeger:Dislocations and Mechanical Properties of Crystals, p. 243, John Wiley & Sons, New York, 1957.
2. N. F. Mott and F. R. N. Nabarro: Rep. Conf. Strength Solids, Bristol, 1948, p. 1.
3. N. F. Mott:Imperfections in Nearly Perfect Crystals, p. 173, John Wiley & Sons, New York, 1955.
4. J. Friedel:Internal Stresses and Fatigue in Metals, p. 244, Elsevier, Amsterdam, 1959.
5. R. L. Fleischer:The Strength of Metals, p. 93, Rheinhold Press, New York, 1964.