1. Kinetic and Activity Parameters of Anaerobic Fermentation Systems;Agardy,1963
2. The bacteriology of activated sludge;Allen;J. Hyg. Camb.,1944
3. Standard Methods for the Examination of Water and Wastewater;American Public Health Association,1965
4. The microbiology of a Lubeck activated sludge plant;Austin;Water Waste Treatment J.,1969
5. Determination of sludge activity: A possibility of controlling activated sludge plants;Bucksteeg,1966