@Article{acp-11-4705-2011,
AUTHOR = {Hooghiemstra, P. B. and Krol, M. C. and Meirink, J. F. and Bergamaschi, P. and van der Werf, G. R. and Novelli, P. C. and Aben, I. and R\"ockmann, T.},
TITLE = {Optimizing global CO emission estimates using a four-dimensional variational data assimilation system and surface network observations},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {11},
YEAR = {2011},
NUMBER = {10},
PAGES = {4705--4723},
URL = {http://www.atmos-chem-phys.net/11/4705/2011/},
DOI = {10.5194/acp-11-4705-2011}
}