1. I. O. Bashkin, A. Yu. Pagnuev, A. F. Gurov, V. K. Fedotov, G. E. Abrosimova, and E. G. Ponyatovskii, Fiz. Tverd. Tela (St. Petersburg) 42(1), 163 (2000) [Phys. Solid State 42 (1), 170 (2000)].
2. I. O. Bashkin, V. K. Fedotov, M. V. Nefedova, V. G. Tissen, E. G. Ponyatovsky, A. Schiwek, and W. B. Holzapfel, Phys. Rev. B: Condens. Matter 68, 105441 (2003).
3. V. V. Aksenenkov, V. D. Blank, B. A. Kul’nitskii, and E. I. Estrin, Fiz. Met. Metalloved. 69, 154 (1990).
4. V. P. Dmitriev, L. Dubrovinsky, T. Le Bihan, A. Kuznetsov, H.-P. Weber, and E. G. Poniatovsky, Phys. Rev. B: Condens. Matter 73, 094 114 (2006).
5. I. O. Bashkin, V. V. Shestakov, M. K. Sakharov, V. K. Fedotov, and E. G. Ponyatovskii, Fiz. Tverd. Tela (St. Petersburg) 50(7), 1285 (2008) [Phys. Solid State 50 (7), 1337 (2008)].