1. T. R. Volk, N. V. Razumovski, A. V. Mamaev, and N. M. Rubinina, J. Opt. Soc. Am. B 13, 1457 (1996).
2. V. A. Vysloukh, V. Kutuzov, and V. V. Shuvalov, Kvantovaya Élektron. (Moscow) 23, 157 (1996).
3. V. A. Vysloukh, V. Kutuzov, V. M. Petnikova, and V. V. Shuvalov, Zh. Éksp. Teor. Fiz. 111, 705 (1997) [JETP 84, 388 (1997)].
4. F. S. Chen, J. T. La Macchia, and D. V. Fraser, Appl. Phys. Lett. 13, 223 (1968).
5. K. N. Zabrodin and A. N. Penin, Kvantovaya Élektron. (Moscow) 18, 622 (1991).