@phdthesis{76406,
  author = {Adrian Simmons},
  title = {Development of the ERA-40 data-assimilation system},
  year = {2001},
  journal = {Workshop on Re-analysis, 5-9 November 2001},
  number = {3},
  pages = {11-30},
  month = {2001},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}