1. H. Sakaki, Jpn. J. Appl. Phys. 21, L381 (1982).
2. K. Inoue, H. Sakaki, J. Yoshino, and T. Hotta, J. Appl. Phys. 58, 4277 (1985).
3. A. A. Gorbatsevich, V. V. Kapaev, Yu. V. Kopaev, and V. Ya. Kremlev, Phys. Low-Dimens. Semicond. Struct., No. 4/5, 57 (1994).
4. A. A. Gorbatsevich, V. V. Kapaev, and Yu. V. Kopaev, Zh. Éksp. Teor. Fiz. 107, 1320 (1995) [JETP 80, 734 (1995)].
5. B. G. Konoplev and E. A. Ryndin, Izv. Vyssh. Uchebn. Zaved., Élektron., No. 3, 18 (2006).