10.Alexandre Silva de Vargas, Denise C. C. Dal Molin, Antonio C.F. Vilela, Felipe
                           Jose da Silva, Bruno Pavao, Hugo Veit, “The effect of Na2O/SiO2 molar ratio, curing
                           temperature and age on compressive strength, morphology and microstructure of alkali-activated
                           fly ash-based geopolymers,” Cement & Concrete Composites, Vol. 33, 2011, pp. 653-660.
