Shrestha, Ankit, Sudan Neupane, and Lekhnath Aryal. “Un-Plasticized Polyvinyl Chloride and Its Growth on Nepalese Market”. Journal of Innovations in Engineering Education 3, no. 1 (March 31, 2020): 29–41. Accessed September 27, 2024. https://nepjol.info/index.php/jiee/article/view/34322.