1.
Hamidon MLH, Jumadi R, Khalid A, Jaat N, Salleh H, Samion S. Research On Biodegradable Lubricant in Combustion Engine . JAPTT. 2023;2(2):42-50. Accessed August 12, 2026. https://journal.uthm.edu.my/index.php/japtt/article/view/13280