Alfa, M. I. and Dahunsi, S. O. and Iorhemen, O. T. and Okafor, C. C. and Ajayi, S. A. (2014) Comparative evaluation of biogas production from Poultry droppings, Cow dung and Lemon grass. Bioresource Technology. pp. 270-277. ISSN 0960-8524