@article{KECKHUT07_ACP,
   author = "P. Keckhut and C. David and M. Marchand and S. Bekki and
             J. Jumelet and A. Hauchecorne and M. H{\"o}pfner",
   title  = "Observation of Polar Stratospheric Clouds down to the
             Mediterranean coast",
   journal= "Atmos. Chem. Phys.",
   volume = "7",
   pages  = "5275-5281",
   year   = "2007"   }