1. Pilot scale studies on the treatment of domestic sewage by two-stage biological filtration—with special reference to nitrification;Bruce;Wat. Pollut. Control,1975
2. Report on tertiary treatment pilot plant studies at Sunnyvale, California;Brown and Caldwell Cons. Engineers,1975
3. Design of a nitrifying tertiary trickling filter based on theoretical concepts;Gujer;Wat. Res.,1986
4. Advanced Secondary Treatment with Trickling Filters;Norris;ASCE Spring Convention, Portland, U.S.A.,1980
5. Process Design Manual for Nitrogen Control;U.S. EPA Technology Transfer,1973