Okeke, Eliezer Uchechukwu, and Barinaadaa Thaddeus Lebele-Alawa. 2013. “Modification Design of Petrol Engine for Alternative Fuelling Using Compressed Natural Gas”. International Journal of Engineering and Technology Innovation 3 (2):86-94. https://ojs.imeti.org/index.php/IJETI/article/view/100.