1. V. I. Sokolov, A. T. Lonchakov, S. M. Podgornykh, S. F. Dubinin, S. G. Teploukhov, V. D. Parkhomenko, and N. B. Gurzdev, Fiz. Nizk. Temp. (Kharkov) 33(2), 276 (2007) [Low Temp. Phys. 33 (2), 202 (2007)].
2. S. F. Dubinin, V. I. Sokolov, S. G. Teploukhov, V. D. Parkhomenko, V. V. Gudkov, A. T. Lonchakov, I. V. Zhevstovskikh, and N. B. Gruzdev, Fiz. Tverd. Tela (St. Petersburg) 49(7), 1177 (2007) [Phys. Solid State 49 (7), 1235 (2007)].
3. V. I. Sokolov, S. F. Dubinin, V. V. Gudkov, and A. T. Lonchakov, Fiz. Tverd. Tela (St. Petersburg) 50(9), 1697 (2008) [Phys. Solid State 50 (9), 1766 (2008)].
4. S. F. Dubinin, V. I. Sokolov, A. V. Korolev, S. G. Teploukhov, Yu. G. Chukalkin, V. D. Parkhomenko, and N. B. Gruzdev, Fiz. Tverd. Tela (St. Petersburg) 50(6), 1042 (2008) [Phys. Solid State 50 (6), 1087 (2008)].
5. D. Lubbers and V. Leute, J. Solid State Chem. 43, 339 (1982).