@article{475507,
      url = {http://digitallibrary.un.org/record/475507},
      title = {Questionnaire on safety in rail tunnels : regulations and  general data on rail tunnel safety /},
      publisher = {UN,},
      recid = {475507},
      pages = {3 p. :},
      address = {Geneva :. 2002-09-17},
      year = {2002},
      month = {Sep},
}