@article{572917,
      note = {Includes bibliographical references.},
      url = {http://digitallibrary.un.org/record/572917},
      title = {Statistical journal of the United Nations Economic  Commission for Europe., Vol. 21, no. 2, 2004},
      publisher = {IOS Press,},
      recid = {572917},
      pages = {p. 87-189 :},
      address = {Geneva ;. 2004},
      year = {2004},
}