Isabelle Bloch Fuzzy Spatial Relationships from Mathematical Morphology for Model-Based Pattern Recognition and Spatial Reasoning. 16-33 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2886&spage=16 2003 conf/dgci/2003 DGCI db/conf/dgci/dgci2003.html#Bloch03