1. Yu. A. Izyumov and M. V. Medvedev, Theory of Magnetically Ordered Crystals with Impurities [in Russian], Nauka, Moscow (1970).
2. J. Ziman, Models of Disorder: The Theoretical Physics of Homogeneously Disordered Systems [Russian translation], Mir, Moscow (1982).
3. B. N. Shalaev, Fiz. Tverd. Tela, 52, No. 6, 83–86 (2010).
4. E. Z. Meilikhov and R. M. Farzetdinova, Fiz. Tverd. Tela, 56, No. 4, 679–686 (2014).
5. E. Z. Meilikhov and R. M. Farzetdinova, Fiz. Tverd. Tela, 47, No. 6, 1085–1091 (2005).