1. M.Y. Li and G.D. Li: Ferrite Physics (Science Press, China 1978), p.11.
2. X.D. Liu and B.R. Wu: Journal of Rron and Steel Research, Vol. 5(1993) No. 1, p.45.
3. Y.Y. Wang, X.R. Chen and G.S. Huang: Materials Review, Vol. 18(2004) No. 10, p.54.
4. M.H. Makled, T. Matsui and H. Tsuda: Journal of Materials Processing Technology, Vol. 160(2005) p.229.
5. A. Grujić, J. Stajić-Trošić and M. Stijepović: Ceramic and Polymeric Composites for Various Uses, p.505.