S. Shihab, Mohammed, Abdullah I. Al-Hyaly, and Riyad M. Alobaidi. “ and Metal/MLSS Ratio on the Removal of Cd and Pb in the Activated Sludge Units”,. Al-Rafidain Engineering Journal (AREJ) 17, no. 6 (December 28, 2009): 54–64. Accessed August 7, 2025. https://ojs.uomosul.edu.iq/index.php/arej/article/view/27012.