@misc{74043,
  author = {P. Courtier and Erik Andersson and W.A. Heckley and G.A. Kelly and J. Pailleux and Florence Rabier and Jean-Noël Thépaut and P. Undén and Drasko Vasiljevic and Carla Cardinali and J. Eyre and M. Hamrud and J. Haseler and A. Hollingsworth and A. McNally and A. Stoffelen},
  title = {Variational assimilation at ECMWF},
  year = {1993},
  journal = {ECMWF Technical Memoranda},
  number = {194},
  pages = {84},
  month = {09/1993},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/8786},
  doi = {10.21957/j7h4sk4ha},
  language = {eng},
}