@phdthesis{74764,
  author = {W. Heckley and P. Courtier and J. Pailleux and Erik Andersson},
  title = {The ECMWF variational analysis: General formulation and use of background information},
  year = {1992},
  journal = {Workshop on Variational Assimilation, with special emphasis on Three-dimensional Aspects, 9-12 November 1992},
  pages = {49-94},
  month = {1992},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}