1. N. V. Sidorov, T. R. Volk, B. N. Mavrin, and V. T. Kalinnikov, Lithium Niobate: Defects, Photorefraction, Vibrational Spectrum and Polaritons (Nauka, Moscow, 2003) [in Russian].
2. T. Volk and M. Wohlecke, Lithiumniobate. Defects, Photorefraction and Ferroelectric Switching (Springer, Berlin, 2008).
3. J. P. Huidnard, Photorefractive Materials and Their Applications (Springer, Berlin, 2007).
4. T. S. Chernaya, B. A. Maksimov, T. R. Volk, N. M. Rubinina, and V. I. Simonov, Pis’ma Zh. Eksp. Teor. Fiz. 73 (2003).
5. T. S. Chernaya, T. R. Volk, I. A. Verin, and V. I. Simonov, Kristallografiya 53(4), 612 (2008).