1. J.L. Kroschwitz, Kirk-Othmer Encyclopedia of Chemical Technology, Wiley, New York, 1991.
2. Aqueous geochemistry of chromium: a review;Richard;Water Res.,1991
3. Removing dissolved inorganic contaminants from water;Clifford;Environ. Sci. Technol.,1986
4. U. Forstnr, G.T. Wittman, Metal Pollution in Aquatic Environment, Springer, Berlin, 1979.
5. T.D. Reynolds, P.A. Richards, Unit Operations and Processes in Environmental Engineering, 2nd Edition, PWS Publishers, Boston, MA, 1996.