@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" }