1. H. G. Grundy and I. Hassan, Can. Mineral. 20, 239 (1982).
2. A. P. Khomyakov, E. A. Pobedimskaya, T. N. Nadezhina, et al., Vestn. Mosk. Univ., Ser. 4: Geol., No. 5, 79 (1991).
3. R. K. Rastsvetaeva, K. A. Rozenberg, N. V. Chukanov, et al., in Proceedings of International Symposium “Phase Transformations in Solid Solutions and Alloys,” Sochi, Russia, September 2–5, 2003 (Sochi, 2003), p. 263 [in Russian].
4. L. V. Olysych, I. V. Pekov, I. A. Bryzgalov, and N. V. Chukanov, in Proceedings of the 3rd Fersman Scientific Session of the Kola Branch of the Russian Mineralogical Society, Apatity, Murmansk region, Russia, 2006 (Apatity, 2006), p. 84 [in Russian].
5. V. I. Andrianov, Kristallografiya 32(1), 228 (1987) [Sov. Phys. Crystallogr. 32 (1), 130 (1987)].