“Friction Resistance of Refined, Bleached and Deodorized (RBD) Palm Olein Using Modified Pin-on-Disk Tribotester”. Jurnal Teknologi 60, no. 1 (February 7, 2013): 27–33. Accessed July 23, 2024. https://journals.utm.my/jurnalteknologi/article/view/1437.