I. Higuera, C. Varga, J. G. Palomo, A. Gil-Maroto, T. Vázquez, and F. Puertas, “Mechanical behaviour of alkali-activated blast furnace slag-activated metakaolin blended pastes. Statistical study”, Mater. constr., vol. 62, no. 306, pp. 163–181, Jun. 2012.