1. ECMWF Internal Report;J Andersen,1977
2. Baer, F., 1977: Adjustments of initial conditions required to suppress gravity oscillations in non-linear flows. Beitrage zur Physik der Atmosphäre, 50, 350–366.
3. Baer, F. and Tribbia, J., 1977: On complete filtering of gravity modes through non-linear initialization. Mon. Wea. Rev., 105, 1536–1539.
4. Ballish, B., 1979: Comparison of some non-linear initialization techniques. Preprint volume — Fourth Conference on Numerical Weather Prediction, Silver Spring, Maryland, October, 1979. 9–12.
5. Blumen, W., 1972: Geostrophic adjustment. Reviews of Geophysics and Space Physics, 10, 485–528.