1. N. N. Ledentsov, V. M. Ustinov, V. A. Shchukin, et al., Fiz. Tekh. Poluprovodn. (St. Petersburg) 32(4), 385 (1998) [Semiconductors 32 (4), 343 (1998)].
2. I. A. Kokurin, V. A. Margulis, and A. V. Shorokhov, Izv. Vyssh. Uchebn. Zaved (Volga region), Fiz. 6(9), 96 (2003).
3. S. Huaut and S. P. Najda, Phys. Rev. Lett. 65(12), 1486 (1990).
4. A. E. Zhukov, A. R. Kovis, and V. M. Ustinov, Fiz. Tekh. Poluprovodn. (St. Petersburg) 33(11), 1935 (1999) [Semiconductors 33 (11), 1260 (1999)].
5. V. D. Krevchik, A. B. Grunin, and A. A. Marko, Fiz. Tekh. Poluprovodn. (St. Petersburg) 40(4), 433 (2006) [Semiconductors 40 (4), 427 (2006)].