Twizerimana, Maurice, Milton Marimi, Xumay Bura, and Eric Oyondi Nganyi. 2020. “Biogas Production from Co-Digestion of Cotton Yarn Waste and Human Urine”. Journal of Energy Research and Reviews 6 (1), 20-29. https://doi.org/10.9734/jenrr/2020/v6i130158.