1. 1. M. Born, E. Wolf, Principles of Optics. Pergamon Press, London-NewYork, 1968.
2. 2. MS. Brodin, D.B. Goer, Z.A. Demidenko et al., Two-photon absorption in mixed A°B° semiconductor crystals // Kvantovaya Elektronika (Kiev) No. 10, p. 56-81 (1976) (in Russian).
3. 3. R.A. Baltrameunas, V.1. Gavryushin, Yu.Yu. Vaitkus, Influence of impurities on twophoton absorption in CdS single crystals // Fizika tekhnika poluprovodnikov 18(4), p. 1150-1153 (1976) (in Russian).
4. 4. MLE. de Souza, Cid B. de Araujo, Two-photon absorption in hexagonal CdS // Solid State Communs48 (11), p. 967-970 (1983).
5. 5. E.V. Beregulin, D.P. Dvornikov, E.L. Ivchenko, I.D. Yaroshevski, Polarization properties and linearly circular dichroism for nonlinear light absorption in A°B° semiconductors // Fizika tekhnika poluprovodnikov 9(5), p. 876-885 (1975) (in Russian).