@misc{74487,
  author = {Mike Fisher and P. Courtier},
  title = {Estimating the covariance matrices of analysis and forecast error in variational dataassimilation},
  year = {1995},
  journal = {ECMWF Technical Memoranda},
  number = {220},
  pages = {28},
  month = {08/1995},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/9408},
  doi = {10.21957/1dxrasjit},
  language = {eng},
}