1. B. P. Sobolev, The Rare Earth Trifluorides, Part 1: The High Temperature Chemistry of the Rare Earth Trifluorides (Institute of Crystallography, Moscow, 2000; Institut d’Estudis Catalans, Barcelona, 2000).
2. A. M. Aronova, G. V. Berezhkova, V. B. Aleksandrov, et al., Physical Crystallography (Nauka, Moscow, 1992) [in Russian].
3. M. O. Marychev, E. V. Chuprunov, E. A. Krivandina, et al., Vestn. Novgorod. Gos. Univ., Ser. Fiz. Tverdogo Tela 1(4), 111 (2001).
4. B. P. Sobolev, D. N. Karimov, S. N. Sul’yanov, and Z. I. Zhmurova, Kristallografiya 54(1), 129 (2009) [Crystallogr. Rep. (Engl. Transl.), 54 (1), 122 (2009)].
5. E. A. Sul’yanova, V. N. Molchanov, I. A. Verin, et al., Kristallografiya 54(3), 554 (2009) [Crystallogr. Rep. (Engl. Transl.), 54 (3), 516 (2009)].