1. L. I. Shchepina, Opt. Spektrosk.,83, No. 6, 940–942 (1997).
2. L. G. Popov, E. E. Penzina, V. V. Bryukvin,et al., Opt. Spektrosk.,65, No. 4, 925–929 (1988).
3. L. I. Shchepina, Candidate's Dissertation in Physical and Mathematical Sciences, Irkutsk (1984).
4. B. D. Lobanov, V. M. Kostyukov, N. T. Maksimova,et al., Fiz. Tverd. Tela,37, No. 9, 2545–2549 (1995).
5. Ch. B. Lushchik and A. Ch. Lushchik, Decay of Electronic Excitations with the Formation of Defects in Solids [in Russian], Nauka, Moscow (1989).