1. K. P. Belov, A. K. Zvezdin, A. M. Kadomtseva, and R. Z. Levitin, Orientation Transitions in Rare Earth Magnets (Nauka, Moscow, 1979) [in Russian].
2. V. V. Randoshkin and A. Ya. Chervonenkis, Applied Magnetooptics (Energoatomizdat, Moscow, 1990) [in Russian].
3. A. K. Zvezdin and A. P. Pyatakov, Phys.-Usp. 52(8), 845 (2009).
4. B. Yu. Sokolov, Phys. Solid State 53(8), 1581 (2011).
5. Handbook of Physical Quantities, Ed. by I. S. Grigoriev and E. Z. Meilikhov (Energoatomizdat, Moscow, 1991; CRC Press, Boca Raton, Florida, United States, 1997).