TY - GEN AU - P. Courtier AU - Erik Andersson AU - W.A. Heckley AU - J. Pailleux AU - Drasko Vasiljevic AU - M. Hamrud AU - A. Hollingsworth AU - Florence Rabier AU - Mike Fisher BT - ECMWF Technical Memoranda CY - Shinfield Park, Reading DA - 01/1998 DO - 10.21957/unhecz1kq LA - eng M1 - 241 PB - ECMWF PP - Shinfield Park, Reading PY - 1998 EP - 30 T2 - ECMWF Technical Memoranda TI - The ECMWF implementation of three dimensional variational assimilation. Part 1:Formulation UR - https://www.ecmwf.int/node/8787 ER -