@article{244088,
      url = {http://digitallibrary.un.org/record/244088},
      title = {Concentration indices in European coal industries :  replies to the questionnaire /},
      publisher = {UN,},
      recid = {244088},
      pages = {11 p. :},
      address = {Geneva :. 1993-07-14},
      year = {1993},
      month = {Jul},
}