1. WRC. Theory, design and operation of nutrient removal activated sludge processes. Water Research Commission, P.O. Box 824, Pretoria 0001, South Africa, 1984.
2. Biological excess phosphorus removal—steady state process design;Wentzel;Water SA,1990
3. Prediction of the performance of enhanced biological phosphorus removal plants;Maurer;Water Sci Tech,1994
4. A general model for the activated sludge process;Dold;Prog Water Technol,1980
5. Dold PL, Wentzel MC, Billing AE, Ekama GA, Marais GvR. Activated sludge simulation programs. Water Research Commission, P.O. Box 824, Pretoria 0001, South Africa, 1991.