Hamdan, Rafidah, and Duncan Mara. 2013. “Aerated Blast-Furnace-Slag Filters for the Simultaneous Removal of Nitrogen and Phosphorus from Primary Facultative Pond Effluents”. International Journal of Integrated Engineering 5 (1). https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/769.