M. Amelsakhi and  A. Sohrabi-Bidar and  A. Shareghi,  Spectral Assessing of Topographic Effects on Seismic Behavior of Trapezoidal Hill.   journal   = {International Journal of Structural and Construction Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 88(4). 245 - 252
    [viewed 11 December 2019]. Available from: https://publications.waset.org/pdf/9997931.