Hassan, Sarkawt Rostam. “Investigation of the Properties of High-Density Polyethylene Pipes Used in Kurdistan for Piping System of Potable Water”. Kurdistan Journal of Applied Research 6, no. 2 (January 26, 2022): 166–180. Accessed August 11, 2025. https://kjar.spu.edu.iq/index.php/kjar/article/view/701.