@article{255837,
      note = {Includes bibliographical references.},
      url = {http://digitallibrary.un.org/record/255837},
      title = {Progress report on the incorporation of level II factors  into the critical level of ozone for yield reduction in  crops and its subsequent mapping : technical report /},
      publisher = {UN,},
      recid = {255837},
      pages = {11 p. :},
      address = {Geneva :. 1998-06-16},
      year = {1998},
      month = {Jun},
}