1. Standard Methods for the Examination of Water and Wastewater;APHA,1989
2. Microfauna of an activated sludge pilot plane treating effluents from a pharmaceutical industry;Bécares,1991
3. Ecological and engineering aspects of a two-stage activated sludge plant treating industrial wastewater;Bécares,1994
4. Dynamic behavior of an activated sludge plant;Berthouex;Wat. Res.,1978
5. Das AB-Verfahren zur biologischen Abwasserinigung, Institute fur Siedlungswasserwirtschaft der Rhein;Böhnke,1987