Ambler, S. W.: What's Missing from the UML? Techniques that can help model effective business applications, Object Magazine 7 (1997)8
Loos, P.; Allweyer, Th.: Process Orientation and Object-Orientation - An Approach for Integrating UML and Event-Driven Process Chains (EPC), Publication of the Institut für Wirtschaftsinformatik, Paper 144, Saarbrücken 1998.