Fernández-Jiménez, A., and A. Palomo. “Factors Affecting Early Compressive Strength of Alkali Activated Fly Ash (OPC-Free) Concrete”. Materiales De Construcción, vol. 57, no. 287, Aug. 2007, pp. 7-22, doi:10.3989/mc.2007.v57.i287.53.