1. BP statistical review of world energy;Outlook,2017
2. Development of palm oil blended with semi-syntetic oil as lubricant using four-ball tribotester;Aiman;Jurnal Tribologi,2017
3. Performance of vegetable oil as lubricant in extreme pressure condition;Syahrullail;Procedia Engineering,2013
4. Syahrullail. Investigation of physical properties for jatropha oil in differenet temperature as lubricant oil;Golshokouh;Life Sci J,2013
5. The prospects of biolubricants as alternatives in automotive applications;Mobarak;Renew Sustain Energy Rev,2014