1. R. W. Minck, R. W. Terhune, and W. G. Rado, Appl. Phys. Lett. 3, 181 (1963).
2. N. Bloembergen, Usp. Fiz. Nauk 96, 307 (1969).
3. V. S. Butylkin, A. E. Kaplan, Yu. G. Khronopulo, and E. M. Yakubovich, Resonance Interactions of Light with Substance (Nauka, Moscow, 1977).
4. Y. R. Shen, The Principles of Nonlinear Optics (Wiley, New York, 1984; Nauka, Moscow, 1989).
5. V. G. Bespalov, V. N. Krylov, V. N. Mikhailov, et al., Opt. Spektrosk. 70, 332 (1991) [Opt. Spectrosc. 70, 193 (1991)].