@phdthesis{75988,
  author = {C. Piccolo},
  title = {Evolution of forecast error covariances in the dD-Var and ETKF methods},
  year = {2009},
  journal = {ECMWF Workshop on Diagnostics of data assimilation system performance, 15 - 17 June 2009},
  pages = {27-36},
  month = {2009},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}