Patrick G. T. Healey James King Nik Swoboda Co-ordinating Conventions in Graphical Dialogue: Effects of Repetition and Interaction. 286-300 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2980&spage=286 2004 conf/diagrams/2004 Diagrams db/conf/diagrams/diagrams2004.html#HealeyKS04