@misc{75899,
  author = {J. Pailleux and W.A. Heckley and Drasko Vasiljevic and Jean-Noël Thépaut and Florence Rabier and Carla Cardinali and Erik Andersson},
  title = {Development of a variational assimilation system},
  year = {1991},
  journal = {ECMWF Technical Memoranda},
  number = {179},
  pages = {51},
  month = {08/1991},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/11480},
  doi = {10.21957/59wwop6fh},
  language = {eng},
}