P1, A., and W. L.P. “Solidification/Stabilization Treatment of Spent Catalyst (Vâ‚‚Oâ‚…) from a Sulfuric Acid Plant Using Ordinary Portland Cement (OPC) and an Additive”. Malaysian Journal of Science, vol. 27, no. 1, Apr. 2008, pp. 7-18, https://adum.um.edu.my/index.php/MJS/article/view/7927.