1. Use Case Maps for Object-oriented Systems;Buhr,1996
2. Use case maps as architectural entities for complex systems;Buhr;IEEE Transactions on Software Engineering,1998
3. UCM User Group, UCMNav 2, 2004. Available from: .
4. ITU-T—International Telecommunications Union, Recommendation Z.100 (08/02): Specification and description language (SDL), Geneva, Switzerland, 2002.
5. OMG—Object Management Group (2003), Unified Modeling Language Specification, Version 1.5. Available from: .