@manual{75333,
  author = {G. Larsen and C. Little and A. Lorenc and I. Rutherford},
  title = {Analysis error calculations for the FGGE},
  year = {1977},
  number = {11},
  pages = {63},
  month = {06/1977},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}