@phdthesis{76077,
  author = {Florence Rabier and Jean-Noël Thépaut and P. Courtier},
  title = {Four dimensional variational assimilation at ECMWF},
  year = {1996},
  journal = {Seminar on Data Assimilation, 2-6 September 1996},
  pages = {213-250},
  month = {1996},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}