1. I. V. Bondar’, A. A. Vaĭpolin, V. Yu. Rud’, et al., Fiz. Tekh. Poluprovodn. (St. Petersburg) 41, 160 (2007) [Semiconductors 41, 155 (2007)].
2. A. P. Belyaev and V. P. Rubets, Fiz. Tekh. Poluprovodn. (St. Petersburg) 35, 294 (2001) [Semiconductors 35, 279 (2001)].
3. A. P. Belyaev, V. P. Rubets, and V. V. Antipov, Fiz. Tekh. Poluprovodn. (St. Petersburg) 40, 790 (2006) [Semiconductors 40, 770 (2006)].
4. A. P. Belyaev, V. P. Rubets, and I. P. Kalinkin, Fiz. Tverd. Tela (St. Petersburg) 39, 382 (1997) [Phys. Solid State 39, 333 (1997)].