Marco Aiello Carlos Areces Maarten de Rijke Spatial Reasoning for Image Retrieval. 1999 conf/dlog/1999 Description Logics http://SunSITE.Informatik.RWTH-Aachen.DE/Publications/CEUR-WS/Vol-22/aiello.ps db/conf/dlog/dlog1999.html#AielloAR99