1. K. D. Tsendin, Electronic Phenomena in Glassy Chalcogenide Semiconductors (Nauka, St.-Petersburg, 1996) [in Russian].
2. Tanaka Keiji, “Nonlinear Optics in Glasses: How Can We Analyze?,” in Proceedings of the 7th International Conference on Solid State Chemistry (Pardubice, Czech Rep., 2006), p. 60.
3. A. Zakery and S. R. Elliott, J. Non-Cryst. Sol. 330, 1 (2003).
4. A. I. Isaev, L. P. Kazakova, E. A. Lebedev, S. I. Mekhtieva, and I. I. Yatlinko, Avt. Svidet. No. 1512015 (Moscow, 1989).
5. L. P. Kazakova, E. A. Lebedev, A. I. Isaev, S. I. Mekh- tieva, N. B. Zakharova, and I. I. Yatlinko, Fiz. Tekh. Poluprovodn. 27, 959 (1993) [Semiconductors 27, 520 (1993)].