Tao Cheng Martien Molenaar Hui Lin 0002 Formalizing fuzzy objects from uncertain classification results. 27-42 2001 15 International Journal of Geographical Information Science 1 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1365-8816&volume=15&issue=1&spage=27 db/journals/gis/gis15.html#ChengML01