Khalaf, Ahmed Lateef, et al. “THE EFFECTS OF CERIUM PROMOTER ON THE PERFORMANCE OF COBALT-BASED CATALYSTS IN FISCHER TROPSCH SYNTHESIS FOR LIQUID FUEL PRODUCTION”. IIUM Engineering Journal, vol. 21, no. 2, July 2020, pp. 1-11, doi:10.31436/iiumej.v21i2.1150.