WASET
    M. Azadi and  M. Kalhor,  Study of the Effect of Seismic Behavior of Twin Tunnels Position on Each Other.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2014, vol. 90(6). 625 - 627
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9998427.