@article{Kirsch2015,
  author    = {Ansgar Kirsch},
  title     = {Experimental investigation of the face stability of shallow tunnels in sand},
  journal   = {Acta Geotechnica},
  volume    = {5},
  number    = {1},
  pages     = {43 -- 62},
  doi       = {10.1007/s11440-010-0110-7},
  year      = {2015},
}