1. Ch. B. Lushchik and A. Ch. Lushchik, Decay of Electronic Excitations with Formation of Defects in Solids [In Russian] (Nauka, Moscow, 1989), 264 pp.
2. I. N. Ogorodnikov, V. Yu. Ivanov, and A. V. Kruzhalov, Fiz. Tverd. Tela (St. Petersburg) 36, 3287 (1994) [Phys. Solid State 36, 1748 (1994)].
3. A. I. Kuznetsov, V. N. Abramov, V. V. Myurk, and B. R. Namozov, Fiz. Tverd. Tela (Leningrad) 33, 2000 (1991) [Sov. Phys. Solid State 33, 1126 (1991)].
4. V. Mürk and N. Yaroshevich, J. Phys.: Condens. Matter 7, 5857 (1995).
5. V. Kisand, R. Kink, M. Kink, J. Maksimov, M. Kirm, and I. Martinson, Physica Scripta 54, 542 (1996).