1. R. G. Newburgh, P. Blacksmith, A. J.ts Budreau, and J. C. Sethares,Proc. IEEE,62, No. 12, 1621 (1974).
2. S. M. Kozel, V. N. Listvin, S. V. Shatalin, and R. V. Yushkaytis,Opt. Spektrosk.,61, No. 6, 1295 (1986).
3. G. B. MalykinIzv. Vyssh. Uchebn. Zaved., Radiofiz.,34, No. 6, 817 (1991).
4. V. A. Zborovskii and E. E. Fradkin,Zh. Eksp. Teor. Fiz.,66, No. 4, 1219 (1974).
5. V. A. Zborovskii, E. A. Tiunov, and E. E. FradkinIzv. Vyssh. Uchebn. Zaved., Radiofiz.,21, No. 6, 816 (1978).