Andreas Leicher Jörn Guy Süß Augmenting UML Models for Composition Conflict Analysis. 127-140 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3442&spage=127 2005 conf/fase/2005 FASE db/conf/fase/fase2005.html#LeicherS05