R. Alias and  A. Kasa and  M. R. Taha,  Particle Size Effect on Shear Strength of Granular Materials in Direct Shear Test.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2014, vol. 95(11). 1144 - 1147
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9999711.