1. Effect of Cr(III) compounds on biological waste water treatment;Gauhofer;Das Leder,1975
2. Effect of chromium(VI) on activated sludge;Gokcay;Water Res.,1991
3. Shock load of chromium(VI);Henney;J. Water Pollut. Contr. Fed.,1980
4. ISO, 1986, International Standard ISO 8192. Water Quality: Test for Inhibition of Oxygen Consumption by Activated Sludge
5. Toxic effects of cupric, chromate and chromic ions on biological oxidation;Lamb;Water Res.,1973