Reference
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- VEDERMAN, J. AND HUBERT, W. E., 1957: On the con-servation of finite-difference absolute vorticity in barotropic forecasts. Monthly Weather Review, June 1957, pp. 193–199.
- WELANDER, P., 1956: Analysis of the 500-mb-surface Over a region of no data (unpublished). Report prepared for Royal Swedish Air Force, Stockholm.