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. V. B. Aleksandrov and L. S. Garashina, Dokl. Akad. Nauk SSSR 189(2), 307 (1969) [Sov. Phys. Dokl. 14, 1040 (1969)].
3. B. P. Sobolev, The Rare Earth Trifluorides, Part 2: Introduction to Materials Science of Multicomponent Metal Fluoride Crystals (Institute of Crystallography, Moscow, 2001; Institut d’Estudis Catalans, Barcelona, 2001).
4. M. Faraday, Ann. Physik 107, 247 (1834).
5. P. P. Fedorov and B. P. Sobolev, J. Less-Common Met. 63(1), 31 (1979).