1. V. G. Besprozvannykh and V. P. Pervadchuk, Nonlinear Optics, The School-Book (Perm. Gos. Tekh. Univ., Perm, 2011) [in Russian].
2. Yu. I. Sirotin and M. P. Shaskol’skaya, Introduction to Crystal Physics, The School-Book (Nauka, Moscow, 1979) [in Russian].
3. D. Marinotto, E. Lucenti, G. Scavia, R. Ugo, S. Tavazzi, G. Mattei, and E. Cariati, J. Mater. Chem., No. 2, 8532 (2014). doi 10.1039/C4TC01445F
4. I. Pavlovetc, S. Draguta, M. Fokina, T. Timofeeva, and I. Denisyuk, Opt. Commun. 362, 64 (2015). doi 10.1016/j.optcom.2015.05.034
5. G. Anandhababu, R. Parumal Ramasamy, and P. Ramasamy, Mater. Chem. Phys., No. 117, 326 (2009).