Michael A Musa, Silver E Ejejigbe, & I. P. Okokpujie, E. J. E. “Optimization of Process Parameters Influencing Biogas Production from Rumen and Municipal Waste: Analytical Approach”. COVENANT JOURNAL OF ENGINEERING TECHNOLOGY, vol. 3, no. 2, Dec. 2019, https://journals.covenantuniversity.edu.ng/index.php/cjet/article/view/1793.