Pierre-Alain Muller Philippe Studer Jean Bézivin Platform Independent Web Application Modeling. 220-233 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2863&spage=220 2003 conf/uml/2003 UML db/conf/uml/uml2003.html#MullerSB03