Dahlila Kamat and  Ismail Mohd Saaid and  Iskandar Dzulkarnain,  Comparative Characterization Study of Malaysian Sand as Proppant.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2011, vol. 57(9). 524 - 529
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/1547.