David Crombie Roger Lenoir Neil McKenzie Klaus Miesenberger Interfacing the Interface: Unification Through Separation. 125-132 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3196&spage=125 2004 conf/uiall/2004 User Interfaces for All db/conf/uiall/uiall2004.html#CrombieLMM04