Christiansen S. H. Breman & J.-J. Kessler: Woody Plants in Agro-Ecosystems of Semi-Arid Regions, - with emphasis on the Sahelian countries. - (Advances series in Agricultural Sciences 23). gt [Internet]. 1. januar 1995 [henvist 26. april 2024];95. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/42057