Constanze Vorwerg Gert Rickheit Typicality Effects in the Categorization of Spatial Relations. 203-222 1998 conf/spatialCognition/1998 Spatial Cognition http://link.springer.de/link/service/series/0558/bibs/1404/14040203.htm db/conf/spatialCognition/spatialCognition1998.html#VorwergR98