H. Jusoh and  N. Sapari and  R.Z. Raja Azie,  Removal of Iron from Groundwater by Sulfide Precipitation.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2011, vol. 60(12). 811 - 817
    [viewed 02 May 2024]. Available from: https://publications.waset.org/pdf/15093.