1. Baar, T., Hähnle, R.: An Integrated Metamodel for OCL Types. In: France, R., Rumpe, B., Bruel, J.-M., Moreira, A., Whittle, J., Ober, I. (eds.) OOPSLA 2000 Workshop Refactoring the UML: In Search of the Core, Minneapolis, MN, USA (2000)
2. Lecture Notes in Computer Science;J.C. Bradfield,2002
3. Lecture Notes in Computer Science;U. Brockmeyer,1998
4. Burmester, S., Flake, S., Giese, H., Schäfer, W., Tichy, M.: Towards the Compositional Verification of Real-Time UML Designs. In: Inverardi, P., Paakki, J. (eds.) Joint 9th European Software Engineering Conference (ESEC) and 11th ACM SIGSOFT International Symposium on the Foundations of Software Engineering (FSE-11), Helsinki, Finland, September 2003, pp. 38–47. ACM Press, New York (2003)
5. Lecture Notes in Computer Science;M.V. Cengarle,2002