1. W. H.Runde and W. W.Schultz, in The Chemistry of Actinide and Transactinide Elements, ed. L. R. Morss, N. M. Edelstein, J. Fuger and J. J. Katz, Springer, Dordrecht, 2006, pp. 1265–1395
2. K. L.Nash, in Handbook on the Physics and Chemistry of Rare Earths, ed. J. K. A. Gschneidner, L. Eyring, G. R. Choppin and H. H. Lander, Elsevier Science, Amsterdam, 1994, pp. 197–238
3. K. L.Nash, C.Madic, J. N.Mathur and J.Lacquement, in The Chemistry of the Actinide and Transactinide Elements, ed. L. R. Morss, N. M. Edelstein, J. Fuger and J. J. Katz, Springer, Dordrecht, 2006, pp. 2623–2798
4. Hard and Soft Acids and Bases
5. Effective ionic radii in oxides and fluorides