Tolba, Omar, Shady Farahaat, Mina Alani, Meryhan Moustafa, Meena Al Yawer, Omar Alobaidi, and Mahmoud Dawood. “Utilization of Polycrete in Manufacturing Manhole Covers: A Comparative Study”. Journal of Student Research (July 9, 2020). Accessed December 4, 2024. https://www.jsr.org/index.php/path/article/view/963.