1. Zh. I. Alferov, Fiz. Tekh. Poluprovodn. (St. Petersburg) 32, 3 (1998) [Semiconductors 32, 1 (1998)].
2. S. V. Gaponenko, Fiz. Tekh. Poluprovodn. (St. Petersburg) 30, 577 (1996) [Semiconductors 30, 315 (1996)].
3. N. N. Ledentsov, Fiz. Tekh. Poluprovodn. (St. Petersburg) 33, 1039 (1999) [Semiconductors 33, 946 (1999)].
4. A. I. Yakimov, V. A. Markov, A. V. Dvurechenskii, and O. P. Pchelyakov, Philos. Mag. B 65, 701 (1992).
5. N. N. Ledentsov, V. M. Ustinov, V. A. Shchukin, et al., Fiz. Tekh. Poluprovodn. (St. Petersburg) 32, 385 (1998) [Semiconductors 32, 343 (1998)].