Tebogo P. Phetla and  Edison Muzenda,  A Multistage Sulphidisation Flotation Procedure for a Low Grade Malachite Copper Ore.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2010, vol. 45(9). 580 - 586
    [viewed 20 January 2020]. Available from: https://publications.waset.org/pdf/11807.