M. Kakavand and  S. A. Naeini,  Effect of Density on the Shear Modulus and Damping Ratio of Saturated Sand in Small Strain.   journal   = {International Journal of Geotechnical and Geological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2019, vol. 156(12). 689 - 692
    [viewed 11 May 2021]. Available from: https://publications.waset.org/pdf/10010954.