1. G. Chen, J.H. Peng and J. Chen: Miner. Metall. Process., 2011, vol. 28, pp. 44-48.
2. J. B. Rosebaum: J. Metals, 1982, vol. 18, pp. 713.
3. Z.H. Chen and C.H. Liu: Manufacture and Application Technology of Titanium Dioxide Pigment, 1st ed., Chemical Industry Press, Beijing, 2006 (in Chinese).
4. J. Gambogi: USGS Mineral Commodities Summary Report, U.S. Geological Survey, pp. 172, 2010, Washington, DC.
5. S. Yuan, W, Chen and S. Hu: Mater. Sci. Eng. C, 2005, vol. 25, pp. 479-85.