@Article{acp-9-1503-2009,
AUTHOR = {Vestreng, V. and Ntziachristos, L. and Semb, A. and Reis, S. and Isaksen, I. S. A. and Tarras\'on, L.},
TITLE = {Evolution of NO$_{x}$ emissions in Europe with focus on road transport control measures},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {9},
YEAR = {2009},
NUMBER = {4},
PAGES = {1503--1520},
URL = {http://www.atmos-chem-phys.net/9/1503/2009/},
DOI = {10.5194/acp-9-1503-2009}
}