@manual{76617,
  author = {C. Temperton},
  title = {Normal modes of a barotropic version of the ECMWF grid-point models},
  year = {1977},
  number = {12},
  pages = {39},
  month = {07/1977},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}