Ahmed T. Farid and  Khaled Z. Soliman,  Effect of Fill Material Density under Structures on Ground Motion Characteristics Due to Earthquake.   journal   = {International Journal of Geotechnical and Geological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2017, vol. 130(10). 952 - 956
    [viewed 22 January 2022]. Available from: https://publications.waset.org/pdf/10007976.