1. K. Lengyel, A. Peter, L. Kovacs, G. Corradi, L. Palfavi, J. Hebling, M. Unferdorben, G. Dravecz, I. Hajdara, Zs. Szaller, and K. Polgar. Appl. Phys. Rew., 2015, 2, 040601.
2. T. Volk, and M. Wohlecke. Lithium niobate. Defects, Photorefraction and Ferroelectric Switching. Springer: Berlin, 2008.
3. N. V. Sidorov, T. P. Volk, B. N. Mavrin, and V. T. Kalinnikov. Lithium Niobate: Defects, Photorefraction, Vibrational Spectrum, Polaritons. Sience: Moscow, 2003.
4. Yu. S. Kuzminov. Electro-Optical and Nonlinear-Optical Crystal of Lithium Niobate. Science: Moscow, 1987.
5. V. Ya. Shur, A. R. Akhmatkhanov, and I. S. Baturin. Appl. Phys. Rew., 2015, 2, 040604.