@phdthesis{76904,
  author = {J. Whittaker},
  title = {Impacts of flow-dependent background-error covariances in the NCEP Global Forecast System},
  year = {2007},
  journal = {ECMWF Workshop on Flow-dependent aspecyts of data assimilation, 11-13 June 2007},
  pages = {87-92},
  month = {2007},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}