1. Dobycha urana metodom podzemnogo vyshchelachivaniya (Uranium Mining by In-Situ Leaching), Mamilov, V.A., Ed., Moscow, 1980.
2. Ryabchikov, D.I. and Ryabukhin, V.A., Analiticheskaya khimiya RZE i ittriya (Analytical Chemistry of Rare Earth Elements and Yttrium), Moscow, 1966.
3. Rimskaya-Korsakova, M.N., Dubinin, A.V., and Ivanov, V.M., J. Anal. Chem., 2003, vol. 58, no. 9, p. 870.
4. Willie, S.N. and Sturgeon, R.E., Spectrochim. Acta, Part B, 2001, vol. 56, p. 1707.
5. De Vito, I.E., Masi, A.N., and Olsina, R.A., Talanta, 1999, vol. 49, p. 929.