@article{501577,
      url = {http://digitallibrary.un.org/record/501577},
      title = {Use of global positioning system (GPS) in the railway  sector : addendum 1 /},
      publisher = {UN,},
      recid = {501577},
      pages = {[1] p.},
      address = {Geneva :. 2003-07-31},
      year = {2003},
      month = {Jul},
}