@article{28627,
      url = {http://digitallibrary.un.org/record/28627},
      title = {A global system of trade preferences among developing  countries (GSTP). Relationship between the global system of  trade preferences among developing countries and the  subregional and regional integration groupings of those  countries : study /},
      publisher = {UN,},
      recid = {28627},
      pages = {ii, 8 p.},
      address = {Geneva :. 1981-06-03},
      year = {1981},
      month = {Jun},
}