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3. in Photorefractive Materials and Their Applications, Ed. by P. Günter and J.-P. Huidnard (Springer, New York, 2007), Vol. 1, p. 421.
4. V. A. Maksimenko, A. V. Syui, and Yu. M. Karpets, Photoinduced Processes in Lithium Niobate Crystals (Fizmatlit, Moscow, 2008) [in Russian].
5. A. V. Syui, N. V. Sidorov, and E. A. Antonycheva, Photorefractive Properties and Particular Features of the Structure of Nonlinear Optical Lithium Niobate Crystals (DVGUPS, Khabarovsk, 2011) [in Russian].