TY - CPAPER AU - A. Wiin-Nielsen AU - E. Källén BT - Seminar on Dynamical Meteorology and Numerical Weather Forecasting, 3-13 September 1979 CY - Shinfield Park, Reading DA - 1979 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 1979 SP - 3 EP - 33 T2 - Seminar on Dynamical Meteorology and Numerical Weather Forecasting, 3-13 September 1979 TI - Non-linear, low order interactions VL - I ER -