1. Frolova, U.K., Kumok, V.N., Serebrennnikov, V.V.: Hydrolysis of ions of the rare earth elements and yttrium in aqueous solutions. Izv. Vysshikh Uchebn. Zavedenii Khim. Khim. Tekhnol. 9, 176–179 (1966); Chem. Abstr. 65, 9816c (1966)
2. Guillaumont, R., Désiré, B., Galin, M.: Première constante d’hydroyse des lanthanides. Radiochem. Radioanal. Lett. 8, 189–198 (1971)
3. Usherenko, L.N., Shorik, N.A.: Hydrolysis of rare earth metal, yttrium, scandium and thorium ions in water and in water–ethanol mixtures. Russ. J. Inorg. Chem. 17, 1533–1535 (1972)
4. Ramírez-García, J.J., Solache-Ríos, M., Jiménez-Reyes, M., Rojas-Hernández, A.: Solubility and hydrolysis of La, Pr, Eu, Er, and Lu in 1M NaCl ionic strength at 303 K. J. Solution Chem. 32, 879–896 (2003)
5. Baes, C.F. Jr., Mesmer, R.E.: The Hydrolysis of Cations. Wiley, New York (1976)