@Article{npg-15-503-2008,
AUTHOR = {Carrassi, A. and Trevisan, A. and Descamps, L. and Talagrand, O. and Uboldi, F.},
TITLE = {Controlling instabilities along a 3DVar analysis cycle by assimilating in  the unstable subspace: a comparison with the EnKF},
JOURNAL = {Nonlinear Processes  in Geophysics},
VOLUME = {15},
YEAR = {2008},
NUMBER = {4},
PAGES = {503--521},
URL = {http://www.nonlin-processes-geophys.net/15/503/2008/},
ISSN = {1023-5809}
}