Erunkulu, I., G. Malumbela, and O. P. Oladijo. “Geopolymer Synthesis and Alkaline Activation Technique of Fly Ash and Slag Source Material: A Review”. Applied Science and Engineering Progress, vol. 16, no. 3, Aug. 2023, p. 6600, doi:10.14416/j.asep.2023.01.005.