1. N. Itoh, Adv. Phys. 31, 491 (1982).
2. Ch. B. Lushik and A. Ch. Lushik, Decay of Electronic Excitations with Formation of Defects in Solids [in Russian], Nauka, Moscow (1989), p. 263.
3. V. I. Al’shits, E. V. Darinskaya, and O. L. Kazakova, JETP Lett. 62, 375 (1995).
4. V. I. Al’shits, E. V. Darinskaya, T. M. Perekalina, and A. A. Urusovskaya, Fiz. Tverd. Tela (Leningrad) 29, 467 (1987) [Sov. Phys. Solid State 29, 265 (1987)].
5. V. I. Al’shits, E. V. Darinskaya, and E. A. Petrzhik, Fiz. Tverd. Tela (Leningrad) 33, 3001 (1990) [Sov. Phys. Solid State 33, 1694 (1990)].