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2. B. K. Vainshtein, Modern Crystallography, Vol. 3 (Nauka, Moscow, 1979) [in Russian].
3. V. A. Timofeeva and I. Kvapil, Kristallografiya 11, 289 (1966).
4. N. G. Ryabtsev, Materials of Quantum Electronics (Sovetskoe Radio, Moscow, 1972) [in Russian].
5. M. F. Kupriyanov, Yu. V. Kabirov, A. G. Rudskaya, et al., Physicochemical Bases of Forming Active Materials (Izd-vo YuFU, Rostov-on-Don, 2011) [in Russian].