Ismail, R. M., N. M. Husami, and S. Alrifaei. “CATALYTIC CRACKING OF HEAVY OIL OF ALIF FIELD – MARIB- YEMEN”. Electronic Journal of University of Aden for Basic and Applied Sciences, vol. 2, no. 3, Sept. 2021, pp. 103-8, doi:10.47372/ejua-ba.2021.3.104.