1. N. M. Bogatov, A. L. Petrov, and É. N. Khabarov, Fiz. Tekh. Poluprovodn. (Leningrad) 16, 353 (1982) [Sov. Phys. Semicond. 16, 222 (1982)].
2. V. A. Bogdanova and N. A. Semikolenova, Fiz. Tekh. Poluprovodn. (St. Petersburg) 26, 818 (1992) [Sov. Phys. Semicond. 26, 460 (1992)].
3. V. V. Prudnikov, I. A. Prudnikova, and N. A. Semikolenova, Phys. Status Solidi B 181, 87 (1994).
4. V. A. Bogdanova, N. A. Semikolenova, and A. S. Semikolenov, Phys. Status Solidi A 120, K121 (1990).
5. V. A. Bogdanova, V. I. Dubovik, V. V. Prudnikov, and N. A. Semikolenova, in Extended Abstracts of the International Conference on Solid State Devices and Materials, Osaka, Japan, 1995, p. 1057.