@article{244087,
      url = {http://digitallibrary.un.org/record/244087},
      title = {Concentration indices in European coal industries :  replies to the questionnaire /},
      publisher = {UN,},
      recid = {244087},
      pages = {17 p. :},
      address = {Geneva :. 1993-07-01},
      year = {1993},
      month = {Jul},
}