1. Standard Methods for the Examination of Water and Wastewater;APHA,1980
2. The Hydrolysis of Cation;Baes,1976
3. Biochemical Engineering Fundamentals;Baily,1986
4. The influence of trivalent chromium on the biological treatment of domestic sewage;Baily;Wat. Pollut. Control,1970
5. Behavior of chromium in soils: III. Oxidation;Bartlett;J. envir. Qual.,1979