1. V. I. Okulov, S. Yu. Paranchich, L. D. Sabirzyanova, et al., Fiz. Nizk. Temp. 30, 441 (2004).
2. V. I. Okulov, Fiz. Nizk. Temp. 30, 1194 (2004).
3. V. V. Gudkov, A. T. Lonchakov, V. I. Sokolov, et al., Phys. Status Solidi B 242, R30 (2005).
4. V. V. Gudkov, A. T. Lonchkov, V. I. Sokolov, et al., Fiz. Tverd. Tela (St. Petersburg) 47, 1498 (2005) [Phys. Solid State 47, 1556 (2005)].
5. V. V. Gudkov, A. T. Lonchakov, A. V. Tkach, et al., J. Electron. Mater. 33, 815 (2004).