1. K.A. Gschneidner, J.C.G. Bunzil, V.K. Pecharsky (Eds.), Handbook of the Physics and Chemistry of Rare Earths, North Holand, 2009.
2. Rare Earth Magnetism;Jensen,1991
3. Magnetic Properties of Rare Earth Metals,1972
4. Electric Quadrupole Interaction in Noncubic Metals;Witthuhn,1983