Adam, I. K., A.Aziz, A., Yusup, S., Heikal, M. and Hagos, F. Y. (2016) “Optimization of Performance and Emissions of a Diesel Engine Fuelled with Rubber Seed- Palm Biodiesel Blends using Response Surface Method”, Asian Journal of Applied Sciences, 4(2). Available at: https://ajouronline.com/index.php/AJAS/article/view/3584 (Accessed: 4 December 2021).