@phdthesis{73680,
  author = {L. Berre and O. Pannekoucke and G. Desroziers and S. Stefanescu and B. Chapnik and L. Raynaud},
  title = {A variational assimilation ensemble and the spatial filtering of its error covariances: increase of sample size by local spatial averaging},
  year = {2007},
  journal = {ECMWF Workshop on Flow-dependent aspecyts of data assimilation, 11-13 June 2007},
  pages = {151-168},
  month = {2007},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}