@article{25378,
      note = {Concerns treatment of quality changes.},
      url = {http://digitallibrary.un.org/record/25378},
      title = {Note /},
      publisher = {UN,},
      recid = {25378},
      pages = {1 p.},
      address = {Geneva :. 1981-08-07},
      year = {1981},
      month = {Aug},
}