1. S. S. Gorelik, S. V. Dobatkin, and L. M. Kaputkina, Recrystallization of Metals and Alloys (MISIS, Moscow, 2005) [in Russian]
2. E. N. Popova, V. V. Popov, E. P. Romanov, and V. P. Pilyugin, “Effect of the degree of deformation on the structure and thermal stability of nanocrystalline niobium produced by high-pressure torsion,” Phys. Met. Metallogr. 103, 407–413 (2007).
3. V. V. Popov, E. N. Popova, A. V. Stolbovsky, and V. P. Pilyugin, “The structure of Nb obtained by severe plastic deformation and its thermal stability,” Mater. Sci. Forum 667–669, 409–414 (2011).
4. V. V. Popov, E. N. Popova, V. P. Pilyugin, D. D. Kuznetsov, and A. V. Stolbovsky, “Nanostructuring of pure metals by severe plastic deformation at cryogenic temperatures,” IOP Conf. Ser.: Mater. Sci. Eng. 63, 012096 (2014).
5. B. Oberdorfer, D. Setman, E. -M. Steyskal, A. Hohenwarter, W. Sprengel, M. Zehetbauer, R. Pippan, and R. Wurschum, “Grain boundary excess volume and defect annealing of copper after high-pressure torsion,” Acta Mater. 68, 189–195 (2014).