Cost-Effective Recycling of Spent Engine Oil for Lubricant Recovery Using a Simplified Purification Process. مجلة العلوم الشاملة, [S. l.], v. 10, n. 39, p. 548–554, 2026. DOI: 10.65405/69cenf74. Disponível em: https://www.cjos.dtasd.com/index.php/journal/article/view/1462. Acesso em: 7 مارس. 2026.