@Article{acpd-7-13989-2007,
AUTHOR = {Kr\"uger, K. and Tegtmeier, S. and Rex, M.},
TITLE = {Long-term climatology of air mass transport through the Tropical Tropopause Layer (TTL) during NH winter},
JOURNAL = {Atmospheric Chemistry and Physics Discussions},
VOLUME = {7},
YEAR = {2007},
NUMBER = {5},
PAGES = {13989--14010},
URL = {http://www.atmos-chem-phys-discuss.net/7/13989/2007/},
DOI = {10.5194/acpd-7-13989-2007}
}