@article{167527,
      url = {http://digitallibrary.un.org/record/167527},
      title = {Mapping of critical levels and loads : note /},
      publisher = {UN,},
      recid = {167527},
      pages = {2 p.},
      address = {Geneva :. 1993-05-03},
      year = {1993},
      month = {May},
}