1. Naumov, A.V., An Overview of the World Market of Rare-Earth Metals, Izv. vuzov. Tsvetnaya metallurgiya, 2008, no. 1, pp. 22–31 [in Russian].
2. Malyutin, Yu.S. and Samsonov, A.E., The World Market of Rare-Earth Metals, Moscow: Academy of Conjuncture of Industrial Markets, 2007, issue 12.
3. Rare-Earth Elements, http://ru.wikipedia.org/wiki [in Russian].
4. Rare Earths of Russia, http://golden-sommer.ru/REDKIE-ZEMLI-ROSSII.html [in Russian].
5. Samsonov, A.E., Prospects for the Manufacture and Consumption of Rare-Earth Products in Russia (aesam@igem.ru), Moscow Division of the Institute of geology of Ore deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, http://www.minsoc.ru/Files Base/2008-3-39-0 [in Russian].