Sapkota, Prajwal, and Laxman Poudel. “Heat Exchanger for Bio-Digester under Thermophilic Range”. Journal of Advanced College of Engineering and Management 5 (December 13, 2019): 79–88. Accessed May 2, 2024. https://www.nepjol.info/index.php/JACEM/article/view/26691.