Regeneration of Engine Used Oils by Solvent Extraction. Iraqi Journal of Science, [S. l.], v. 63, n. 12, p. 5119–5130, 2022. DOI: 10.24996/ijs.2022.63.12.3. Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/6000.. Acesso em: 12 may. 2024.