TY - CPAPER AU - Jean-Noël Thépaut BT - Workshop on non-linear aspects of data assimilation, 9-11 September 1996 CY - Shinfield Park, Reading DA - 1996 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 1996 SP - 469 EP - 492 T2 - Workshop on non-linear aspects of data assimilation, 9-11 September 1996 TI - 4DVAR developments at Meteo-France ER -