@article{244086,
      url = {http://digitallibrary.un.org/record/244086},
      title = {Concentration indices in European coal industries :  replies to the questionnaire /},
      publisher = {UN,},
      recid = {244086},
      pages = {6 p. :},
      address = {Geneva :. 1992-11-30},
      year = {1992},
      month = {Nov},
}