Kumar, K. A., Pinto, P., Hawaldar, I. T., & Kumar, B. P. (2020). Biogas from Cattle Dung as a Source of Sustainable Energy: A Feasibility Study. International Journal of Energy Economics and Policy, 10(6), 370–375. Retrieved from https://www.econjournals.com/index.php/ijeep/article/view/10135