1. A. P. Belyaev, V. P. Rubets, and V. V. Antipov, Fiz. Tekh. Poluprovodn. 40, 790 (2006) [Semiconductors 40, 770 (2006)].
2. A. P. Belyaev, V. P. Rubets, and I. P. Kalinkin, Fiz. Tverd. Tela 39, 382 (1997) [Phys. Solid State 39, 333 (1997)].
3. A. P. Belyaev and V. P. Rubets, Fiz. Tekh. Poluprovodn. 35, 294 (2001) [Semiconductors 35, 279 (2001)].
4. A. P. Belyaev, V. P. Rubets, and V. V. Antipov, Fiz. Tekh. Poluprovodn. 41, 1477 (2007) [Semiconductors 41, 1457 (2007)].
5. N. V. Agrinskaya and T. V. Mashovets, Fiz. Tekh. Poluprovodn. 28, 1505 (1994) [Semiconductors 28, 843 (1994)].