@misc{78770,
  keywords = {workshop, data assimilation, diagnostics, systems performance},
  author = {R. Todling},
  title = {An approach to assess observation impact based on observation-minus-forecast residuals},
  year = {2009},
  month = {2009},
  url = {https://www.ecmwf.int/node/15272},
  language = {eng},
}