@article{169192,
      note = {Estimates updated as of 30 April 1993 = Evaluations a jour  du 30 avril 1993 = Previsiones actualizadas al 30 de abril  de 1993.},
      url = {http://digitallibrary.un.org/record/169192},
      title = {Narcotic drugs : estimated world requirements for 1993,  statistics for 1991. Supplement no. 4 = Stupéfiants :  évaluations des besoins du monde pour 1993, statistiques  pour 1991. Supplément no 4 = Estupefacientes : previsiones  de las necesidades mundiales para 1993, estadísticas para  1991. Suplemento no. 4.},
      publisher = {UN,},
      recid = {169192},
      pages = {20 p. :},
      address = {Vienna :. 1993},
      year = {1993},
}