Alan M. MacEachren Representations to Mediate Geospatial Collaborative Reasoning: A Cognitive-Semiotic Perspective. 1 http://link.springer.de/link/service/series/0558/bibs/1889/18890001.htm 2000 conf/diagrams/2000 Diagrams db/conf/diagrams/diagrams2000.html#MacEachren00