1. Volk, T. and Wöhlecke, M., Lithium Niobate. Defects, Photorefraction and Ferroelectric Switching, Berlin: Springer, 2008.
2. Maksimenko, V.A., Syui, A.V., and Karpets, Yu.M., Fotoindutsirovannye protsessy v kristallakh niobata litiya (Photoinduced Processes in Lithium Niobate Crystals), Moscow: Fizmatlit, 2008.
3. Günter, P. and Huignard, J.-P., Photorefractive Materials and Their Applications 2–Materials, New York: Springer, 2007, p. 365.
4. Mandelbrot, B., The Fractal Geometry of Nature, San-Francisco: W.H. Freeman, 1983.
5. Sidorov, N.V., Manukovskaya, D.V., and Palatnikov, M.N., Opt. Spectrosc., 2015, vol. 118, no. 6, p. 955.