@phdthesis{76645,
  author = {Jean-Noël Thépaut},
  title = {Assimilating only surface-pressure observations in 3D and 4D-Var},
  year = {2006},
  journal = {ECMWF/Geo Workshop on Atmospheric Reanalyis, 19-22 June 2006},
  pages = {107-112},
  month = {2006},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}