Wongkvanklom, A., P. Posi, P. Kasemsiri, V. Sata, T. Cao, and P. Chindaprasirt. “Strength, thermal conductivity and sound absorption of cellular lightweight high calcium fly ash geopolymer concrete”. Engineering and Applied Science Research, vol. 48, no. 4, June 2021, pp. 487-96, https://ph01.tci-thaijo.org/index.php/easr/article/view/243363.