@article{28623,
      url = {http://digitallibrary.un.org/record/28623},
      title = {Generalized System of Preferences. Rules of origin : note  /},
      publisher = {UN,},
      recid = {28623},
      pages = {[5] p., including annexes.},
      address = {Geneva :. 1981-09-09},
      year = {1981},
      month = {Sep},
}