1. H. Z. Wu and S. G. Roberts: Acta Materialia Vol. 51(2003), p.149.
2. Namier: Research on Processing Technology and Surface Quality of Engineering Ceramics. Tianjin University(1999).
3. Z. X. Yang, et al: Analysis of X- radial Diffraction(Shanghai University Publications, China 1988).
4. C. Z. He, et al: Experimental Technique X-radial Diffraction(Shanghai science and technology Publications, China 1988).
5. Q.Z. Qi and P.C. Hu: Journal of Guangzhou Chemistry Vol. 25/3(2000), p.33.