Gonzalo Génova Juan Llorens Morillo Pierre Metz Rubén Prieto-Díaz Hernán Astudillo Open Issues in Industrial Use Case Modeling. 52-61 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3297&spage=52 2004 conf/uml/2004ml UML Satellite Activities db/conf/uml/ml2004.html#GenovaMMPA04