@misc{78763,
  keywords = {workshop, data assimilation, diagnostics, systems performance},
  author = {R. Menard and Y. Yang and Y. Rochon},
  title = {Convergence and stability of estimated error variances derived from assimilation residuals in observation space},
  year = {2009},
  month = {2009},
  url = {https://www.ecmwf.int/node/15264},
  language = {eng},
}