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3. G. P. Katys, N. V. Kvartsov, L. E. Chirkov, and S. M. Konovalov, Modulation and Deflection of Light Beams [in Russian], Izd. Nauk, Moscow (1967).
4. E. R. Mustel' and V. N. Parygin, Methods of Light Modulation and Scanning [in Russian], Izd. Nauka, Moscow (1970).
5. A. S. Sonin and A. S. Vasilevskaya, Electrooptical Crystals [in Russian], Atomizdat, Moscow (1971).