Hadi Farhadian and  Homayoon Katibeh,  Groundwater Seepage Estimation into Amirkabir Tunnel Using Analytical Methods and DEM and SGR Method.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2015, vol. 99(3). 296 - 301
    [viewed 21 April 2021]. Available from: https://publications.waset.org/pdf/10000821.