1. M. A. Paalanen, T. F. Rosenbaum, G. A. Thomas, and R. N. Bhatt, Phys. Rev. Lett. 48, 1284 (1982).
2. V. V. Baidakov, V. N. Ermakov, A. E. Gorin, et al., Phys. Status Solidi B 198, 149 (1996).
3. V. N. Ermakov, V. V. Kolomoets, L. T. Panasjuk, and V. E. Rodionov, in Proceedings of the 20th International Conference on Physics of Semiconductors, Thessaloniki, 1990, Vol. 3, p. 1803.
4. P. I. Baranskii, V. V. Kolomoets, and S. S. Korolyuk, Phys. Status Solidi B 116, K109 (1983).
5. V. V. Baidakov, N. N. Grigor’ev, V. N. Ermakov, et al., Fiz. Tekh. Poluprovodn. (Leningrad) 17, 370 (1983) [Sov. Phys. Semicond. 17, 234 (1983)].