Taib, Norhidayah Mat, et al. “Combustion Characteristics of a Direct Injection Diesel Engine Fueled With Diesel-Ethanol-Palm Oil Methyl Ester Blends”. International Journal of Engineering & Technology, vol. 7, no. 3.17, Aug. 2018, pp. 239-43, https://doi.org/10.14419/ijet.v7i3.17.21917.