1. APHA, AWWA, WEF (1992) Standard Methods for the Examination of Water and Wastewater, 18th edn. Am. Public Health Ass., Am. Water Works Ass., and Water Environ. Fed., Washington, DC
2. Selective renovation of eutrophic wastes: Phosphate removal;Boari;Wat. Res.,1976
3. Quantitative estimation in COD units of refractory organic compounds produced by activated sludge microorganisms;Chudoba;Wat. Res.,1985
4. Chemical processing of wastewater for nutrient removal;Eliassen;J. WPCF,1968
5. Gächter R. and Imboden D. M. (1985) Lake restoration. In Chemical Processes in Lakes (Edited by Stumm W.), pp. 365–388. John Wiley and Sons, New York, NY