4Luo Y. The current status of the hard ferrite industry in China & its future[A]. Hard Ferrite Magnets'99[C]. San Francisco, 1999.
5Tenaud P, Morel A, Kools F, et al. Recent improvement of hard ferrite permanent magnets based on La-Co substitution [J]. J Alloys Compds, 2004, 370:331-334.