@misc{JU-97,
  author = {H J{\"a}rvinen and P. Und{\'e}n},
  title = {Observation screening and background quality control in the ECMWF 3D-Var data assimilation system},
  year = {1997},
  journal = {ECMWF Technical Memoranda},
  number = {236},
  pages = {33},
  month = {09/1997},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/10352},
  doi = {10.21957/lyd3q81},
  language = {eng},
}