Kutty, Nur Azureen Alwi, et al. “Influence on the Phase Formation and Strength of Porcelain by Partial Substitution of Fly Ash Compositions”. International Journal of Engineering and Technology, vol. 7, no. 4.30, Nov. 2018, pp. 271-5, https://doi.org/10.14419/ijet.v7i4.30.22281.