@misc{79166,
  keywords = {workshop, atmospheric re-analysis},
  author = {Jean-Noël Thépaut and G.A. Kelly},
  title = {Assimilation only surface pressure observations in 3D and 4DVAR},
  year = {2006},
  month = {2006},
  url = {https://www.ecmwf.int/node/15723},
  language = {eng},
}