TY  - GEN
AU  - Bouttier, F.
TI  - The Development of 12-hourly 4D-var
T2  - ECMWF/Technical Memorandum
VL  - 348
PY  - 2001///
CY  - Geneva
PB  - WMO
KW  - PREVISAO NUMERICA
KW  - IM
ER  -