1. Removing nitrogen from waste water;Adams;Envir. Sci. Technol.,1973
2. Standard Examination of Water and Wastewater;APHA,1989
3. Biological denitrification;Barnard;Wat. Pollut. Control,1973
4. Cut P and N without chemicals;Barnard;Wat. Wastes Engng,1974
5. Flocculation and flocculation basins;Camp,1953