TY - GEN AU - Roberto Buizza BT - ECMWF Technical Memoranda CY - Shinfield Park, Reading DA - 10/1993 DO - 10.21957/ftmf8rtst LA - eng M1 - 196 PB - ECMWF PP - Shinfield Park, Reading PY - 1993 EP - 35 T2 - ECMWF Technical Memoranda TI - Computation of optimal perturbations using a local projection operator: A winter casestudy UR - https://www.ecmwf.int/node/8413 ER -