@phdthesis{73651,
  author = {L. Bengtsson},
  title = {Problems in four-dimensional data assimilation},
  year = {1975},
  journal = {Seminar on the Scientific Foundation of Medium Range Weather Forecasts, 1-12 September 1975},
  volume = {I},
  pages = {113-138},
  month = {1975},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}