Sytze de Bruin Querying probabilistic land cover data using fuzzy set theory. 359-372 2000 14 International Journal of Geographical Information Science 4 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1365-8816&volume=14&issue=4&spage=359 db/journals/gis/gis14.html#Bruin00