1. Standard Methods for the Examination of Water and Wastewater;Barnard,1981
2. Cut P and N without chemicals;Barnard;Wat. Wastes Engng,1974
3. A review of biological phosphorus removal in the activated sludge process;Barnard;Wat. SA,1976
4. Lactate dehydrogenase UV assay with pyruvate and NADH;Bergmeyer,1974
5. The location and nature of accumulated phosphorus in activated sludge;Buchan;Wat. Sci. Technol.,1982