@phdthesis{76391,
  author = {Adrian Simmons},
  title = {Observations, assimilation and the improvement of global weather prediction - some results from operational forecasting and ERA-40},
  year = {2003},
  journal = {Seminar on Recent developments in data assimilation for atmosphere and ocean, 8-12 September 2003},
  pages = {1-28},
  month = {2003},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}