Hamdoun, Ammar, and Maher Ahmed. “Preparation of Activated Carbon from Spent Lubricant Oils Using Catalyst Polymer Processing”. Journal of Education and Science (JES) 25, no. 2 (June 1, 2012): 44–57. Accessed August 6, 2025. https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23860.