1. Dai DS, Qian KM (1987) Ferromagnetism (in Chinese). Science Press, Beijing
2. Coey JMD (2010) Magnetism and magnetic materials. Cambridge University Press, Cambridge, UK
3. Han BS (1991) J Magn Magn Mater 100:455
4. Magnetic bubble writing group (1986) Mangetic buble, (in Chinese). Science Press, Beijing
5. Han BS, Ling JW, Li BZ, Nie XF, Tang GD (1986) Acta Phys Sin 35:130