Le, T., and B. Tran. “Removal of Non-Biodegredable Organics from Landfill Leachate Using Paper Mill Sludge As a Low Cost Adsorpbent”. VNUHCM Journal of Science and Technology Development, Vol. 17, no. 2, June 2014, pp. 5-12, doi:https://doi.org/10.32508/stdj.v17i2.1297.