Malgwi, D. J., M. A. Musa, and A. N. Jones. “Biogas Production and Nitrogen Recovery from Cattle and Chicken Dung Through Anaerobic Digestion”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 21, no. 1, Mar. 2025, pp. 279-85, https://azojete.com.ng/index.php/azojete/article/view/1030.