TRIBOLOGICAL PERFORMANCE OF PALM KERNEL OIL ADDED WITH NANOPARTICLE COPPER OXIDE USING FOURBALL TRIBOTESTER. Jurnal Teknologi, [S. l.], v. 79, n. 7-4, 2017. DOI: 10.11113/jt.v79.12265. Disponível em: https://journals.utm.my/jurnalteknologi/article/view/12265.. Acesso em: 6 may. 2024.