1. Gravity thickening of sewage sludges;DICK;Water Pollution Control,1972
2. Behaviour of the activated sludge in secondary settling;FEUILLADE;Techniques et Sciences Municipales,1972
3. Effects of diurnal variations in flow of settled sewage on the performance of high-rate activated sludge plants;BOON;Water Pollution Control,1972
4. Discussion of the design parameter for secondary sedimentation tanks;KALBSKOPF;Water Research,1972
5. JACQUART, J. C., LEFORT, D. and ROVEL, J. M. An attempt to take account of biological storage in the mathematical model of activated sludge behaviour. I.A.W.P.R. Conference of Jerusalem, 1972.