1. A. V. Davydov, Yu. N. Isaev, and V. M. Samoilov, Izv. Ross. Akad. Nauk, Ser. Fiz. 61, 2221 (1997).
2. V. G. Alpatov, Yu. D. Bayukov, V. M. Gelis, et al., Laser Phys. 10, 952 (2000).
3. V. G. Alpatov, Yu. D. Bayukov, A. V. Davydov, et al., Laser Phys. 15, 1680 (2005).
4. G. E. Bizina, A. G. Beda, N. A. Burgov, and A. V. Davydov, Zh. Eksp. Teor. Fiz. 45, 1408 (1963) [Sov. Phys. JETP 18, 973 (1963)].
5. A. G. Beda, G. E. Bizina, and A. V. Davydov, in Problems of Nuclear Physics and Physics of Elementary Particles (Nauka, Moscow, 1975), p. 209 [in Russian].