Aderibigbe, A. A., A. A. Ogunsola, and W. O. Sanusi. 2011. “EFFECTS OF EXHAUST GAS RECIRCULATION ON PERFORMANCE AND EXHAUST GAS EMISSIONS OF SPARK IGNITION ENGINES”. LAUTECH Journal of Engineering and Technology 7 (1):110-15. https://laujet.com/index.php/laujet/article/view/99.