1. Binnemans, K.: Rare earth beta-diketonates. In: Handbook on the Physics and Chemistry of Rare Earths, vol. 35, chap. 225, pp. 107–272. Elsevier Science B.V., Amsterdam (2005)
2. Zolotov, Y., Kuzmin, A.N.M.: Ekstraktsia Acylpirazolonami. Nauka, Moscow (1977) (in Russian)
3. Nash, K., Jensen, M.: Analytical separation of the lanthanides: basic chemistry and methods. In: Handbook on the Physics and Chemistry of Rare Earths, vol. 28, chap. 180, pp. 311–371. Elsevier Science B.V., Amsterdam (2000)
4. Rydberg, J., Cox, M., Musikas, C., Choppin, G.: Solvent Extraction Principles and Practice. Marcel Dekker, New York (2004)
5. Reddy, A.S., Reddy, B.R., Reddy, M.L.P.: Solvent extraction of Se(IV) and Te(IV) from hydrochloric acid solutions by sulphoxides and their mixtures. Radiochim. Acta 31, 161–163 (1982)