@misc{80477,
  keywords = {Symposium, 4D-Var},
  author = {Jean-Noël Thépaut},
  title = {4D-Var: From early results to operational implementation},
  year = {2018},
  journal = {Symposium: 20 years of 4D-Var at ECMWF},
  month = {2018},
  language = {eng},
}