TY - GEN AU - Erik Andersson BT - ECMWF newsletter C1 - Research DA - 2017 DO - 10.21957/9fxea2 IS - 153 LA - eng PY - 2017 SE - Meteorology SP - 37 EP - 40 T2 - ECMWF newsletter TI - How to evolve global observing systems UR - https://www.ecmwf.int/node/18200 ER -