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. B. P. Sobolev, A. M. Golubev, and P. Érrero, Kristallografiya 48(1), 148 (2003) [Crystallogr. Rep. 48, 141 (2003)].
3. V. B. Aleksandrov and L. S. Garashina, Dokl. Akad. Nauk SSSR 189(2), 307 (1969) [Sov. Phys. Dokl. 14, 1040 (1969)].
4. E. A. Ryzhova, V. N. Molchanov, A. A. Artyukhov, et al., Kristallografiya 49(4), 668 (2004) [Crystallogr. Rep. 49, 591 (2004)].
5. E. A. Sul’yanova, A. P. Shcherbakov, V. N. Molchanov, et al., Kristallografiya 50(2), 235 (2005) [Crystallogr. Rep. 50, 203 (2005)].