Hashim Mahmood, an, Ahmed Y. Shehab, and Riyadh M. Saleh Al- Obaidi. “Early Prediction Of Toxic Shocks Happening In Activated Sludge Biological Systems”. Al-Rafidain Engineering Journal (AREJ) 18, no. 1 (February 28, 2010): 26–35. Accessed September 8, 2025. https://jamh.uomosul.edu.iq/index.php/arej/article/view/30752.