@phdthesis{74408,
  author = {Richard Engelen},
  title = {Estimation of atmospheric CO2 concentrations through the data assimilation of AIRS radiances in the ECMWF 4D-Var system},
  year = {2004},
  journal = {ECMWF Workshop on Assimilation of high spectral resolution sounders in NWP, 28 June - 1 July 2004},
  pages = {113-122},
  month = {2004},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}