@article{CLARMANN91_AO,
   author = "T. von Clarmann and H. Fischer and H. Oelhaf",
   title  = "Instabilities in retrieval of atmospheric trace gas profiles 
             caused by the use of atmospheric level models",
   journal= "Appl. Opt.",
   volume = "30",
   number = "21",
   pages  = "2924-2925",
   year   = "1991"   }