1. Nitrification of activated sludge effluent: Bio Surf process;Antonie;Wat. Swge Wks,1974
2. Nitrification of activated sludge effluent: Bio Surf process;Antonie;Wat. Swge Wks,1974
3. Fixed Biological Surfaces—Wastewater Treatment: RBC;Antonie,1976
4. Standard Methods of Examination of Water and Wastewater;APHA,1985
5. Treatment of phenol-formaldehyde resin wastewater using RBC;Bracewell,1980