1. Systems for phosphate and nitrogen removal;Albertson,1969
2. Phosphate extraction process;Albertson;J. Water Pollut. Control Fed.,1969
3. Phosphate removal processes prove practical;Anon;Environ. Sci. Technol.,1968
4. Progress Report;Anon,1969
5. Mineral controlled phosphorus removal in the activated sludge process;Barth;J. Water Pollut. Control Fed.,1967