1. Yu. S. Kuz’minov, Electro-Optical and Nonlinear Optical Lithium Niobate Crystal (Nauka, Moscow, 1987) [in Russian].
2. N. V. Sidorov, T. R. Volk, B. N. Mavrin, and V. T. Kalinnikov, Lithium Niobate: Defects, Photorefraction, Vibrational Spectrum, Polaritons (Nauka, Moscow, 2003) [in Russian].
3. M. N. Palatnikov, Doctoral Dissertation in Technical Sciences (Apatity, 2010).
4. T. Volk and M. Wohlecke, Lithium Niobate. Defects, Photorefraction and Ferroelectric Switching (Springer, Berlin, 2008).
5. R. Gunter, Photorefractive Materials and Their Applications. Part 1 (Springer, 2007).