1. D. D. Mishin, Magnetic Materials (Vysshaya Shkola, Moscow, 1991) [in Russian].
2. D. Gall, in Handbook of Magnetism and Advanced Magnetic Materials, Vol. 2: Micromagnetism, Ed. by H. Kronmuller and S. Parkin (Wiley, New York, 2007), p. 1023.
3. G. S. Kandaurova, Soros. Obraz. Zh. 1, 100 (1997).
4. V. K. Vlasko-Vlasov and M. V. Indenbom, Sov. Phys. JETP 59 (3), 633 (1984).
5. R. M. Vakhitov and A. R. Yumaguzin, Phys. Solid State 43 (1), 65 (2001).