@misc{79111,
  keywords = {workshop, data assimilation, flow-dependent},
  author = {J. Purser and M de Pondeca and D.F. Parrish and D. Dévényi},
  title = {Covariance modelling in a grid-point analysis},
  year = {2007},
  month = {2007},
  url = {https://www.ecmwf.int/node/15664},
  language = {eng},
}