1. L.P. Wang, H. Wang, G. Qi, X.J. Li, Z.Q. Chen, and Y.Q. Dou: Chin. J. Rare Met, 2004, vol. 28(1), pp. 265-267.
2. J. Li, Z.T. Zhang, M. Zhang, M. Guo, and X.D. Wang: Steel Res. Int, 2011, vol. 82(6), pp. 607-614.
3. L. Wen and J.Z. Zhang: J. Iron Steel Res., 2011, vol. 23 (5), pp. 1–3, 19.
4. F. Yan, C. Li, and B. Liang: Chin. J. Process Eng, 2006, vol. 6 (3), pp. 413-417.
5. X.H. Liu and Z.T. Sui: Chin. J. of Nonferrous Met, 2002, vol. 12(6), pp. 1281-1284.