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Okonkwo, Ugochukwu C. and onokpite, E. and Onokwai, A. O (2018) Comparative study of the optimal ratio of biogas production from various organic wastes and weeds for digester/restarted digester. Journal of King Saud University – Engineering Sciences, 30 (2). pp. 123-129. ISSN 1018-3639