@manual{74114,
  author = {R. Daley},
  title = {Spectral characteristics of the ECMWF objective analysis system},
  year = {1983},
  number = {40},
  pages = {119},
  month = {12/1983},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}