1. Samonov, A.E., Raw material priorities for the soonest renaissance and sustainable development of Russia’s rare earth industry, Tsvetn. Met., 2012, no. 3, pp. 16–20.
2. Xie, F., Zhang, T.A., Dreisinger, D., and Doyle, F., A critical review on solvent extraction of rare earths from aqueous solutions, Miner. Eng., 2014, vol. 56, pp. 10–28.
3. McGill, I., Rare earth metals, in Handbook of Extractive Metallurgy, Weinheim, Germany: Wiley–VCH, 1997, vol. 3, pp. 1695–1741.
4. Gupta, C.K. and Krishnamurthy, N., Extractive Metallurgy of Rare Earths, Boca Raton, Fla.: CRC, 2005.
5. Bautista, R.G., Separation chemistry, in Handbook on the Physics and Chemistry of Rare Earths, Amsterdam: Elsevier, 1995, vol. 21, pp. 1–28.