1. The PUTU system;de Jager,1997
2. Computing drought severity and forecasting its future impact on grazing in a GIS;de Jager,1997
3. Using expected gross margin uncertainty to delimit good and poor areas for maize in the semi-arid regions of South Africa;de Jager;Applied Plant Science,1990
4. Simulering van die produksiepotensiaal van veld en die kwantifisering van droogte in die sentrale Oranje-Vrystaat;Fouché,1992
5. Managing for climate variability—the role of seasonal climate forecasting in improving agricultural systems;Hammer,1996