Florence Dupin de Saint-Cyr Robert Jeansoulin Henri Prade Spatial Information Fusion: Coping with Uncertainty in Conceptual Structures. 66-74 2008 ICCS Supplement http://ceur-ws.org/Vol-354/p36.pdf conf/iccs/2008s db/conf/iccs/iccss2008.html#Saint-CyrJP08