@article{KEMNITZER02
   author = "H. Kemnitzer and S. Hilgers and G. Schwarz and T. Steck and 
             T. v. Clarmann and M. H{\"o}pfner and K. Ressel",
   title  = "Trace Gas Retrieval including Horizontal Gradients",
   journal= "Adv. Space. Res.",
   volume = "29",
   number = "11",
   pages  = "1631-1636",
   year   = "2002"   }