1. J. K. Rath, W. Fuhs, and H. Mell, J. Non-Cryst. Sol. 137–138, 279 (1991).
2. I. A. Kurova, É. V. Larina, N. N. Ormont, and D. V. Senashko, Fiz. Tekh. Poluprovodn. 31, 1455 (1997) [Semiconductors 31, 1257 (1997)].
3. D. Redfield. Mater. Res. Soc. Symp. Proc. (Pittsburgh), No. 258, 341 (1992).
4. N. N. Ormont, I. A. Kurova, and I. P. Zvyagin, in Proceedings of the 5th Russian Conference on Physics of Semiconductors, Nizhni Novgorod, 2001, Vol. 1, p. 153.
5. N. N. Ormont, I. A. Kurova, and G. V. Prokof’ev, Fiz. Tekh. Poluprovodn. 39, 960 (2005) [Semiconductors 39, 924 (2005)].