1. Institute for Metals Superplasticity Problems; Russian Academy of Sciences; 39 Khalturin Street 450001 Ufa Russia
2. National Research Tomsk State University; 36 Lenin Street 634050 Tomsk Russia
3. Department of Physics; National Research Saratov State University; Astrakhanskaya 83 410012 Saratov Russia
4. Instituto Pluridisciplinar; Universidad Complutense; Paseo Juan XXIII, 1 28040 Madrid Spain