@misc{76072,
  author = {Florence Rabier and H Järvinen and E. Klinker and J.-F. Mahfouf and Adrian Simmons},
  title = {The ECMWF operational implementation of four dimensional variational assimilation. Part I: Experimental results with simplified physics},
  year = {1999},
  journal = {ECMWF Technical Memoranda},
  number = {271},
  pages = {26},
  month = {02/1999},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/11794},
  doi = {10.21957/1yb0ok68e},
  language = {eng},
}