NEKVASIL, V., DIVIŠ, M. Localized 4f and 5f moments: magnetism. In: BUSCHOV, K. H. J., CAHN, R. W., FLEMINGS, M. C., ILSCHNER, B., KRAMER, E. J., MAHAJAN, S., eds. Encyclopedia of Materials: Science and Technology. Amsterdam: Elsevier Science, 2001, s. 4613-4627.