@phdthesis{73657,
  author = {L. Bengtsson},
  title = {Current problems in four-dimensional data assimilation},
  year = {1980},
  journal = {Seminar on Data Assimilation Methods, 15-19 September 1980},
  pages = {195-218},
  month = {1980},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}