1. Canada Animal Manure Management Guide;Agriculture Canada,1980
2. Standard Methods for Examination of Water and Wastewater;APHA,1985
3. Biological Control of Nitrogen in Wastewater Treatment;Barnes,1983
4. Deleterious effects of animal manure;Barnett,1991
5. Combined sludge denitrification of sewage utilization internal carbon sources;Christensen;Prog. Wat. Technol.,1977