Jan Pettersen Nytun Christian S. Jensen Modeling and Testing Legacy Data Consistency Requirements. 341-355 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2863&spage=341 2003 conf/uml/2003 UML db/conf/uml/uml2003.html#NytunJ03