@Article{acp-5-1-2005,
AUTHOR = {Scheele, M. P. and Siegmund, P. C. and Velthoven, P. F. J.},
TITLE = {Stratospheric age of air computed with trajectories based on various 3D-Var and 4D-Var data sets},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {5},
YEAR = {2005},
NUMBER = {1},
PAGES = {1--7},
URL = {http://www.atmos-chem-phys.net/5/1/2005/},
DOI = {10.5194/acp-5-1-2005}
}