@Article{acpd-7-9561-2007, AUTHOR = {Lahoz, W. A. and Errera, Q. and Swinbank, R. and Fonteyn, D.}, TITLE = {Data assimilation of stratospheric constituents: a review}, JOURNAL = {Atmospheric Chemistry and Physics Discussions}, VOLUME = {7}, YEAR = {2007}, NUMBER = {4}, PAGES = {9561--9633}, URL = {http://www.atmos-chem-phys-discuss.net/7/9561/2007/}, ISSN = {1680-7367} }