1. S. Wang: Proc. China 2009 Annual Meeting of Tin, Antimony and Bismuth, Kunming, Antaike, China, 2009, pp. 42-51.
2. J.-G. Yang, J.-Y. Yang, M.-T. Tang, C.-B. Tang, and W. Liu: Hydrometallurgy, 2009, vol. 96, pp. 342-48.
3. J.-G. Yang, C.-B. Tang, S.-H. Yang, J. He, and M.-T. Tang: Hydrometallurgy, 2009, vol. 100, pp. 5-9.
4. C.-Y. Sun, X.-C. Cheng, and C.-G. Li: China Tungsten Ind., 2004, vol. 19, pp. 8-14.
5. X.-Y. Zhou and Z.-J. Zhang: Nonferrous Metals, 2007, vol. 59, pp. 75-79.