S. Zu Nurain Ahmad, H. R, W. Afnizan Wan Mohamed, N. Othman, and N. Shaylinda Mohd Zin, “Chemical Composition, pH Value, and Points of Zero Charge of High Calcium and High Iron Electric Arc Furnace Slag”, IJET, vol. 7, no. 3.23, pp. 1–4, Aug. 2018, doi: 10.14419/ijet.v7i3.23.17249.