Dinh, H.-Q. and Thanh-Bang Nguyen 2021. Composition of ground granulated blast-furnace slag and fly ash-based geopolymer activated by sodium silicate and sodium hydroxide solution: Multi-response optimization using Response Surface Methodology. Vietnam Journal of Science, Technology and Engineering. 63, 1 (Mar. 2021), 21-29. DOI:https://doi.org/10.31276/VJSTE.63(1).21-29.