Kossay K. Al-Ahmady, Dr., and ZenaA. AL-Shrefy. 2013. “Effect of Hydraulic Detention Time and WaterTemperature Onthe Removal Efficiency of Organic and Nutrients Pollutants InDuckweed Based Wastewater Stabilization Ponds”. Al-Rafidain Engineering Journal (AREJ) 21 (5):63-73. https://doi.org/10.33899/rengj.2013.79419.