Ahmed DJ, Al-Nidawi MR, Chali M, Bahjat A. Purification of Used Lubricating Oils Using Vacuum Distillation. Journal of Petroleum Research and Studies [Internet]. 2024Mar.20 [cited 2024Jul.3];14(1):111-30. Available from: https://jprs.gov.iq/index.php/jprs/article/view/766