@misc{78759,
  keywords = {workshop, data assimilation, diagnostics, systems performance},
  author = {B Chapnik},
  title = {Online observation covariance matrix tuning based on optimality diagnostic},
  year = {2009},
  month = {2009},
  url = {https://www.ecmwf.int/node/15260},
  language = {eng},
}