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2. A. A. Popov, V. V. Sherstnev, and Yu. P. Yakovlev, Pis’ma Zh. Tekh. Fiz. 24(2), 72 (1998) [Tech. Phys. Lett. 24, 73 (1998)].
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4. A. P. Astakhova, E. A. Grebenshchikova, E. V. Ivanov, A. N. Imenkov, E. V. Kunitsina, Ya. A. Parkhomenko, and Yu. P. Yakovlev, Fiz. Tekh. Poluprovodn. (St. Petersburg) 38, 1466 (2004) [Semiconductors 38, 1419 (2004)].
5. T. N. Danilova, B. E. Zhurtanov, A. N. Imenkov, and Yu. P. Yakovlev, Fiz. Tekh. Poluprovodn. (St. Petersburg) 39, 1281 (2005) [Semiconductors 39, 1235 (2005)].