Rijal, Krishna Prasad. “High Density Polyethylene (HDP) Pipe As a Lining Material in Hilly Regions of Nepal”. Hydro Nepal: Journal of Water, Energy and Environment 18 (March 15, 2016): 25–29. Accessed May 18, 2024. https://www.nepjol.info/index.php/HN/article/view/14640.