Abdul Rahman Mohamed, Chang Chin Li, Lee Keat Teong, Subhash Bhatia and. 2012. “Preparation of Active Absorbent for Flue Gas Desulfurization From Coal Bottom Ash: Effect of Absorbent Preparation Variables”. IIUM Engineering Journal 2 (1). https://doi.org/10.31436/iiumej.v2i1.340.