A.-K. Mohamme, Abdul-Halim, Dhia El-Din M. Kassim, and Huda M. Hassan. “Quality Improvement of Spent Lubricating Oil”. Iraqi Journal of Chemical and Petroleum Engineering 8, no. 3 (September 30, 2007): 31–35. Accessed May 18, 2024. https://ijcpe.uobaghdad.edu.iq/index.php/ijcpe/article/view/485.