Aderibigbe, A., A. Ogunsola, and W. Sanus. “ANALYSIS OF EXHAUST GAS EMISSIONS AND PERFORMANCE PARAMETERS ON NON- ROAD SPARK IGNITION ENGINES”. LAUTECH Journal of Engineering and Technology, Vol. 7, no. 1, Aug. 2011, pp. 81-87, https://laujet.com/index.php/laujet/article/view/94.