A.Mohammed, Abdul-Halim, and Noor S.Akram. “The Effect of Operating Conditions of Urea Dewaxing on the Pour Point of Light Lubricating Oil”. Iraqi Journal of Chemical and Petroleum Engineering 11, no. 1 (March 30, 2010): 59–63. Accessed May 3, 2025. https://www.ijcpe.uobaghdad.edu.iq/index.php/ijcpe/article/view/370.