1. Agricultural intensification and flexibility in the Nigerian Sahel;Adams;The Geographical Journal,1997
2. Degradationsprozesse und Desertifikation im semiariden randtropischen Gebiet der Butana/Rep. Sudan;Akhtar-Schuster,1995
3. Interactive Spatial Data Analysis;Bailey,1995
4. Environmental discourses and the Ivorian savanna;Bassett;Annals of the Association of American Geographers,2000
5. Density analysis on large geographical databases. Search for an index of centrality of services at urban scale;Borruso,2004