1. A. P. Belyaev, V. P. Rubets, and I. P. Kalinkin, Fiz. Tekh. Poluprovodn. (St. Petersburg) 31, 966 (1997) [Semiconductors 31, 823 (1997)].
2. A. P. Belyaev, V. P. Rubets, and I. P. Kalinkin, Fiz. Tverd. Tela (St. Petersburg) 39, 382 (1997) [Phys. Solid State 39, 333 (1997)].
3. A. P. Belyaev, V. P. Rubets, and I. P. Kalinkin, Neorg. Mater. 34(3), 238 (1998).
4. A. P. Belyaev, V. P. Rubets, and M. Yu. Nuzhdin, Fiz. Tekh. Poluprovodn. (St. Petersburg) 34, 1208 (2000) [Semiconductors 34, 1157 (2000)].
5. A. P. Belyaev and V. P. Rubets, Fiz. Tekh. Poluprovodn. (St. Petersburg) 35, 294 (2001) [Semiconductors 35, 279 (2001)].