TY - CPAPER AU - P. Gauthier AU - P. Courtier BT - Workshop on Variational Assimilation, with special emphasis on Three-dimensional Aspects, 9-12 November 1992 CY - Shinfield Park, Reading DA - 1992 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 1992 SP - 171 EP - 190 T2 - Workshop on Variational Assimilation, with special emphasis on Three-dimensional Aspects, 9-12 November 1992 TI - Data assimilation with an extended Kalman filter ER -