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2. Use of algae in removing phosphorus from sewage;Bogan;J. sanit. engng Div. Am. Soc. civ. Engrs,1960
3. Removal of nitrogen from tile drainage—a summary report;Brown,1971
4. Removal of nitrate by an algal system;Brown,1971
5. Water Reclamation of South Tahoe;Culp;Water and Wastes Engng,1969