1. Piedra J. KPMG Rare earths elements (Quarterly commodity insights bulletin); 2012.
2. Monazite. Chemical composition. Monazite concentrate. Online access: http://www.monazite.ru/monazite.
3. K.A. Bolshakova. Chemictry and technologies of rare and trace elements. Мoscow: High School; 1976.
4. Nitric acid technology of processing orthite ores. Proceedings of the universities;Buynovsky;Non-ferrous metallurgy,2004
5. V.L. Sofronov, A.S. Buynovsky, A.S. Ryabov, S.N. Kruglov, et al. Processing of thorium-containing waste, obtained after opening REE-containing feed stock with nitric acid. Coll. Abstracts of International Conference REE-2012;