1. V. I. Levchenko, V. N. Yakimovich, L. I. Postnova, et al., in Actual Problems of Solid State Physics, Collection of Articles (Minsk, 2003), pp. 286–297 [in Russian].
2. V. E. Kisel’, V. G. Shcherbitskii, N. V. Kuleshov, et al., Quantum Electron. 35, 611 (2005).
3. V. E. Kisel’, V. G. Shcherbitskii, N. V. Kuleshov, et al., Zh. Prikl. Spectrosk. 72, 747 (2005).
4. N. V. Kravtsov, Quantum Electron. 31, 661 (2001).
5. Yu. F. Vaksman, V. V. Pavlov, Yu. A. Nitsuk, et al., Semiconductors 39, 377 (2005).