1. Belkov I. V., Kozyreva L. V., and Men’shikov Yu. P., New type of rare-metals mineralization in alkaline rocks, Geol. Rudn. Mestorozhd., 1988, no. 2, pp. 90–94.
2. Chakhmouradian, A.R., Rudashevsky, N.S., and Pilipiuk, A.N., Loparite mineralization of the Niorkpakhk Mt. (Khibiny): the role of metasomatism in its formation, Zap. Ross. Mineral. O-va, 1995, no. 2, pp. 70–76.
3. Chakhmouradian, A.R. and Mitchell, R.H., Compositional variation of perovskite group minerals from the Khibiny Complex, Kola Peninsula, Russia, Can. Mineral., 1998, vol. 36, pp. 953–969.
4. Chirva, E.F., Results of crystallographic and optical studying of loparite from Khibiny tundras, Tr. Lomonosov. Inst. Geokhim., Kristallogr., Mineral., 1937, vol. 10, pp. 61–71.
5. Eliseev, N.A. and Nefedov, N.K., Loparite deposits of Luyavrurt, in Proizvoditel’nye sily Kol’skogo poluostrova I (Productive Forces of the Kola Peninsula I, Fersman, A.E Ed., Moscow–Leningrad: Akad. Nauk SSSR, 1940, pp. 77–118.