@misc{74492,
  author = {Mike Fisher},
  title = {On the equivalence between Kalman smoothing and weak-constraint four-dimensional variational data assimilation.},
  year = {2004},
  journal = {ECMWF Technical Memoranda},
  number = {447},
  pages = {12},
  month = {12/2004},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/9415},
  doi = {10.21957/ohuva4avu},
  language = {eng},
}