@inproceedings{Kirsch2015,
  author    = {Ansgar Kirsch},
  title     = {Experimental and numerical investigation of the face stability of shallow tunnels in sand},
  booktitle = {Safe tunnelling for the city and environment : proceedings of the World Tunnel Congress 2009, Budapest, Hungary, 23 to 28 September 2009 / organised by International Tunnelling and Underground Space Association ...},
  pages     = {1 -- 8},
  year      = {2015},
}