Akshat Kumar, Pragna Nannapaneni, Madhumita Samad, Dr. Rajeev Kumar. “Design And Fabrication Of A Low-Cost Mixer For A Biogas Digester”. International Journal of Advanced Science and Technology, Vol. 29, no. 7, June 2020, pp. 9742-8, http://sersc.org/journals/index.php/IJAST/article/view/26642.