Ayoub, Mohamed, and Ahmed El-Morsy. “Upgrading of an Extended Aeration System to Improve Wastewater Treatment”. American Scientific Research Journal for Engineering, Technology, and Sciences 81, no. 1 (August 16, 2021): 23–35. Accessed February 27, 2024. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/6983.