1. N. Bloembergen, Nonlinear Optics (Benjamin, New York, 1965) p. 150.
2. V. S. Starunov and I. L. Fabelinskii, Usp. Fiz. Nauk 98, 441 (1969) [Sov. Phys. Usp. 12, 463 (1970)].
3. Y. R. Shen, The Principles of Nonlinear Optics (John Wiley & Sons, New York, 1984) p. 190.
4. B. Ya. Zel’dovich, N. F. Pilipetskii, V. V. Shkunov, Principles of Phase Conjugation (Springer-Verlag, New York, 1985).
5. Wavefront Reversal in Nonlinear Media, edited by V. I. Bespalov [in Russian] (IPF AN SSSR, Gor’kii, 1982).