1. V. D. Ignat’ev and I. N. Burtsev, Timan Leucoxene: Mineralogy and Problems of Technology [in Russian], Nauka, St. Petersburg (1997).
2. O. B. Kotova, O. M. Lezina, L. Yu. Nazarova, et al. “New technological solutions for ore preparation and extraction of valuable minerals,” Vest. Instituta Geologii Komi Nauch. Tsentra Ural. Otd. Ross. Akad. Nauk, No. 10, 32 – 34 (2012).
3. Yu. I. Ryabkov, P. V. Istomin, A. V. Nadutkin, et al., “Development of scientific principles of technologies of complex processing of quartz-rutile raw material for functional nano materials based on titanium and silicon compounds,” Izv. Komi Nauch. Tsentra Ural. Otd. Ross. Akad. Nauk, 13(1), 19 – 24 (2013).
4. V. A. Karelin and A. I. Karelin, Fluoride Technology for Processing Concentrates of Rare-Earth Metals [in Russian], NTL, Tomsk (2004).
5. I. A. Perovskii and G. V. Ignat’ev, “Fluorine-ammonium method of de-silicizing leucoxene concentrate from the Yaregskoe deposit,” in: Predictive Assessment of the Technological Properties of Minerals by Methods of Applied Mineralogy: Proceedings of Reports at the 7th Russian Seminar on Technological Mineralogy, Karel’skii Nauchnyi Tsentr RAN (2013), pp. 110 – 116.