Gallego, H. ., E. . Toro, and R. . Rojas. “State of the Art: Process of Pozzolan Formation from Ash and Its Applications”. Revista Ingeniería De Construcción, vol. 35, no. 2, Aug. 2020, pp. 119-25, https://ojs.uc.cl/index.php/ric/article/view/40719.