Abigail Amissah-Arthur Bernard Mougenot Maud Loireau Assessing farmland dynamics and land degradation on Sahelian landscapes using remotely sensed and socioeconomic data. 583-599 2000 14 International Journal of Geographical Information Science 6 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1365-8816&volume=14&issue=6&spage=583 db/journals/gis/gis14.html#Amissah-ArthurML00