1. Chemical-biological control of nitrogen and phosphorus in wastewater effluent;Barth;J. Wat. Pollut. Control Fed.,1968
2. Phosphorus removal from wastewater by direct dosing of aluminate to a trickling filter;Barth;J. Wat. Pollut. Control Fed.,1969
3. Biological extraction of nutrients;Borchardt;J. Wat. Pollut. Control Fed.,1968