Idan, Fatimah Kadhim I, and Saleem Mohammed Obyed. “Treatment of Waste Extract Lubricating Oil by Catalytic Cracking Process to Produce Light Fractions”. Al-Khwarizmi Engineering Journal 15, no. 2 (May 28, 2019): 100–107. Accessed July 10, 2026. https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/552.