1. Schoeck G.: Dislocations in Solids, vol. 3, (ed. F. R. N. Nabarro), North Holland, Amsterdam, 1980, p. 77.
2. Haasen P.: Dislocations in Solids, vol. 4, (ed. F. R. N. Nabarro), North Holland, Amsterdam, 1979, p. 155.
3. Neuhäuser H.:in Strength of Metals and Alloys, Proc. ICSMA 5, vol. 3, (eds. P. Haasen, V. Gerold, G. Kostorz), Pergamon Press, Toronto, 1980, p. 1531.
4. Butt M. Z., Feltham P.: Reviews on the Deformation Behavior of Materials, vol. III, (ed. P. Feltham), Freund, Tel-Aviv (Israel), 1978, p. 99.
5. Kocks U. F.: Mater. Sci. & Eng.27 (1977) 291.