Kartini, W., M. D. Astawa, and H. Setiawan. “Optimization of Compressive Strength and Porosity of Normal Concrete Using Fly Ash and Alkaline Activators”. UKaRsT, vol. 6, no. 1, Apr. 2022, pp. 102-16, doi:10.30737/ukarst.v6i1.2481.