M. N. Abdallah, “Wastewater Operation and Maintenance in Egypt (Specific Challenges and Current Responses)”, IJSBAR, vol. 18, no. 2, pp. 125–142, Nov. 2014, Accessed: Sep. 21, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/3150