1. N. V. Sidorov, T. R. Volk, B. N. Mavrin, and V. T. Ka-linnikov, Lithium Niobate: Defects, Photorefraction, Vibrational Spectrum, and Polaritons (Nauka, Moscow, 2003).
2. Yu. S. Kuz’minov, Electrooptical and Nonlinear-Optical Lithium Niobate Crystal (Nauka, Moscow, 1987).
3. S. C. Abrahams, Properties of Lithium Niobate (New York, 1989).
4. S. C. Abrahams, J. M. Reddy, and J. L. Bernstein, J. Phys. Chem. Solids 27, 997 (1966).
5. M. Aillerie, P. Bourson, M. Mostefa, F. Abdi, and M. D. Fontana, J. Phys.: Conf. Ser. 416, 012001 (2013).