1. G.G. Li: Water quality automatic monitor technology and online monitors the instrument's current development. (Beijing 2001).
2. W.B. Li: Industrial Water Treatment. Vol. 11 (2004), pp.61-62.
3. F.B. Wu, Y.X. Qiang: Journal of Northwest University. Vol. 38 No. 5 (2008), pp.731-734.
4. X.F. Hao, G.F. Liu: Science Technology and Project. Vol. 9 (2009), pp.5561-5564.
5. Y.Y. Liu, W.W. Shi: Computer Information. Vol. 25 No. 4 (2009), pp.130-131.