1. D. Zheng, Y. Ma, D. Wu, et al., Phys. Status Solidi A 193, 61 (2002).
2. Y. Ma, X. Li, T. Xie, et al., Mater. Sci. Eng. B 103, 233 (2003).
3. A. S. Kamzin, F. Wei, Z. Yang, and S. A. Kamzin, Fiz. Tverd. Tela (St. Petersburg) 47, 493 (2005) [Phys. Solid State 47, 508 (2005)].
4. A. S. Kamzin, S. A. Kamzin, F. Wei, and Z. Yang, Zh. Tekh. Fiz. 75(1), 131 (2005) [Tech. Phys. 50, 129 (2005)]; Fiz. Tverd. Tela (St. Petersburg) 48, 463 (2006) [Phys. Solid State 48, 492 (2006)].
5. K. H. J. Buschow, Handbook of Magnetic Materials (Elsevier, Amsterdam, 1997), Vol. 10, p. 433.