ABDULLAH, M. H.; IBRAHIM, S. A. . Tribological Behaviour of Bio-lubricants for Machinery using a Four-ball Tribotester. Progress in Engineering Application and Technology, [S. l.], v. 2, n. 2, p. 1038–1050, 2021. Disponível em: https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/2731. Acesso em: 25 jun. 2022.