Osamu Igawa and  Hiroshi Kouchiwa and  Yuji Ito,  Sewer Culvert Installation Method to Accommodate  Underground Construction in an Urban Area with  Narrow Streets (The Development of Shield  Switching Type Micro-Tunneling Method and the  Introduction of Construction Examples).   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 1 - 6
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/9997043.