Ahamed , J.U., M.F. Raiyan, MD. S. Hossain, M.M. Rahman, and B. Salam. “Production of Biogas from Anaerobic Digestion of Poultry Droppings and Domestic Waste Using Catalytic Effect of Silica Gel”. International Journal of Automotive and Mechanical Engineering 13, no. 2 (December 9, 2022): 3503–3517. Accessed May 18, 2024. https://journal.ump.edu.my/ijame/article/view/8468.