Pierre-Alain Muller Cédric Dumoulin Frédéric Fondement Michel Hassenforder 242-245 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3297&spage=242 2004 conf/uml/2004ml UML Satellite Activities db/conf/uml/ml2004.html#MullerDFH04