Kossay K. Al-Ahmady, D. and Haqe Ismaeel, H. 2013. Effect of Using Anaerobic Selectors on the Performance of Continuous Flow Activated Sludge Systems. Al-Rafidain Engineering Journal (AREJ). 21, 6 (Dec. 2013), 88–99. DOI:https://doi.org/10.33899/rengj.2013.82367.