J. Widjajakusuma, I. Bali, G. P. Ng, and K. A. Wibowo, “An Experimental Study on the Mechanical Properties of Low-Aluminum and Rich-Iron-Calcium Fly Ash-Based Geopolymer Concrete”, Adv. technol. innov., vol. 7, no. 4, pp. 295–302, Jul. 2022.