1. X. M. Wu, Hydrogeology and Engineering Geology, 26, 41–43 (1999).
2. Q. Yang, J. X. Li, and W. C. Ding, Groundwater, 29, 72–75 (2007).
3. N. Z. Sun, Groundwater Pollution, Geological Publishing House, Beijing (1989).
4. R. F. Liu, H. H. Chen, Y. L. Wang, and F. Liu, Groundwater, 29, 62–66 (2007).
5. Z. Chen, G. H. Huang, and A. Chakma, Wat. Sci. Tech., 38, 131–138 (1998).