@misc{74488,
  author = {Mike Fisher and Erik Andersson},
  title = {Developments in 4D-Var and Kalman Filtering},
  year = {2001},
  journal = {ECMWF Technical Memoranda},
  number = {347},
  pages = {36},
  month = {09/2001},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/9409},
  doi = {10.21957/5ghofnp6c},
  language = {eng},
}