1. Sidorov, N.V., Palatnikov, M.N., Serebryakov, Yu.A., Lebedeva, E.L., and Kalinnikov, V.T., Effect of nonstoichiometry on the structure, properties, and Raman spectra of lithium niobate crystals, Inorg. Mater., 1997, vol. 33, no. 4, pp. 419–427.
2. Sidorov, N.V., Volk, T.R., Mavrin, B.N., and Kalinnikov, V.T., Niobat litiya: defekty, fotorefraktsiya, kolebatel’nyi spektr, polyaritony (Lithium Niobate: Defects, Photorefractive Properties, Vibrational Spectrum, and Polaritons), Moscow: Nauka, 2003.
3. Sidorov, N.V. and Serebryakov, Yu.A., Investigation of structural peculiarities of impure lithium niobate crystals by Raman spectroscopy, Vibr. Spectrosc., 1994, vol. 6, no. 2, pp. 215–223.
4. Smolenskii, G.A., Bokov, V.A., Isupov, V.A., Krainik, N.N., Pasynkov, R.E., and Shur, M.S., Segnetoelektriki i antisegnetoelektriki (Ferroelectrics and Antiferroelectrics), Leningrad: Nauka, 1971.
5. Myasnikova, T.P. and Myasnikova, A.E., Optical spectra of lithium niobate, Phys. Solid State, 2015, vol. 45, no. 12, pp. 2338–2341.