Martin Gogolla Paul Sammut Jon Whittle Essentials of the 3rd UML Workshop in Software Model Engineering (WiSME'2004). 43-51 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3297&spage=43 2004 conf/uml/2004ml UML Satellite Activities db/conf/uml/ml2004.html#GogollaSW04