Partial nitrification for nitrogen removal from sanitary landfill leachate, Spagni, A., Psaila G., and Rizzo Antonella , Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering, Volume 49, Number 11, p.1331-1340, (2014)

Biological phosphorus and nitrogen removal in a full scale sequencing batch reactor treating piggery wastewater, Tilche, A., Bacilieri E., Bortone G., Malaspina F., Piccinini S., and Stante Loredana , Water Science and Technology, Volume 40, Number 1, p.199-206, (1999)