Syafiqah, I., Wan Yussof, H., Azoddein, A., Chandraseagar, S., & Wan Ishak, F. (2017). A Factorial Analysis Study on Removal of Mercury by Palm Oil Fuel Ash Adsorbent. Chemical Engineering Transactions, 56, 1501-1506. https://doi.org/10.3303/CET1756251