@manual{75449,
  author = {A. Lorenc and I. Rutherford and G. Larsen},
  title = {The ECMWF analysis and data assimilation scheme: Analysis of mass and wind field},
  year = {1977},
  number = {6},
  pages = {47},
  month = {12/1977},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}