@Article{amtd-2-3221-2009,
AUTHOR = {Leit\~ao, J. and Richter, A. and Vrekoussis, M. and Kokhanovsky, A. and Zhang, Q. J. and Beekmann, M. and Burrows, J. P.},
TITLE = {On the improvement of NO$_{2}$ satellite retrievals – aerosol impact on the airmass factors},
JOURNAL = {Atmospheric Measurement Techniques Discussions},
VOLUME = {2},
YEAR = {2009},
NUMBER = {6},
PAGES = {3221--3264},
URL = {http://www.atmos-meas-tech-discuss.net/2/3221/2009/},
DOI = {10.5194/amtd-2-3221-2009}
}