Ahmed, Arman. M.A., A.I. Seedahmed, and Tyseer.Y. M. Ali. “Estimate Friction Factor for Polypropylene Pipes”. Engineering And Technology Journal 7, no. 9 (September 7, 2022): 1467–1470. Accessed November 23, 2024. https://everant.org/index.php/etj/article/view/704.