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Md. Razak, D., Samion Syahrullail, Norzahir Sapawe, Azli Yahya, and N. Nuraliza. A New Approach Using Palm Olein, Palm Kernel Oil, and Palm Fatty Acid Distillate As Alternative Biolubricants: Improving Tribology in Metal-on-metal Contact. Taylor and Francis, 2015.

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