1. A. N. Orlov, V. N. Perevezentsev, and V. V. Rybin, Grain Boundaries in Metals (Metallurgiya, Moscow, 1980).
2. I. Kaur and W. Gust, Fundamentals of Grain and Interphase Boundary Diffusion (Stuttgart, 1989; Mashinostroenie, Moscow, 1991).
3. V. Naundorf, M. P. Macht, A. S. Bakai, et al., J. Non-Cryst. Solids 250–252, 679 (1999).
4. R. Z. Valiev and I. V. Aleksandrov, Nanostructural Materials Received by Severe Plastic Deformation (Logos, Moscow, 2000).
5. R. Z. Valiev, T. M. Razumovskii, and V. I. Sergeev, Phys. Status Solidi A 139, 321 (1993).