Andrew U. Frank Spatial Communication with Maps: Defining the Correctness of Maps Using a Multi-Agent Simulation. 80-99 2000 conf/spatialCognition/2000 Spatial Cognition http://link.springer.de/link/service/series/0558/bibs/1849/18490080.htm db/conf/spatialCognition/spatialCognition2000.html#Frank00