Luna-Galiano, Y., C. Fernández-Pereira, and M. Izquierdo. “Contributions to the Study of Porosity in Fly Ash-Based Geopolymers. Relationship Between Degree of Reaction, Porosity and Compressive Strength”. Materiales De Construcción, vol. 66, no. 324, Dec. 2016, p. e098, doi:10.3989/mc.2016.10215.