M.S. Abolarin, M. M., and O. O. E. E. I.P. Okokpujie. “Emission Comparison of Air-Fuel Mixtures for Pure Gasoline and Bioethanol Fuel Blend (E20) Combustion on Sparking-Ignition Engine”. COVENANT JOURNAL OF ENGINEERING TECHNOLOGY, vol. 5, no. 1, June 2021, https://journals.covenantuniversity.edu.ng/index.php/cjet/article/view/2591.