DAUD, Z.; A RAHMAN, S. E.; AWANG, H.; ABUBAKAR, M. H.; RIDZUAN, M. B.; TAJARUDIN, H. A. Utilization of Waste Paper Sludge as an Alternative Adsorbent for the Adsorption of Ammonia Nitrogen and COD in Stabilized Landfill Leachate. International Journal of Integrated Engineering, v. 10, n. 9, 1 Jan. 2019.