1. V.Z. Bengus, A.M. Dolgin, E.D. Tabachnikova, J. Efimov, Metalofizika 5 (5) (1983) 93 (in Russian).
2. Plasticity theory strength-differential(SD) phenomenon, and volume expansion in metals and plastics
3. A.N. Orlov, V.H. Perevezentsev, V.V. Rybin, Grain boundaries in metals, Moscow, Metallurgy, 1980, p. 153 (in Russian).
4. C. Teodosiu, Elastic Models of Crystal Defects, Editura Academiei Bucuresti, Springer, Berlin, 1982, p. 52.
5. R. Valiev, in: Proceeding of the NATO Advanced Research Workshop on Investigations and Allpications of Severe Plastic Deformation, Moscow, Russia, 2–7 August 1999, Kluwer Academic Publishers, Dordrecht, 2000.