1. IBM: Web Services Architecture Overview (2000),
http://www-128.ibm.com/developerworks/webservices/library/w-ovr/
2. Lecture Notes in Computer Science;W.M.P. Aalst van der,2003
3. Barros, A., Dumas, M., Oaks, P.: A Critical overview of the Web Services Choreography Description Language (WS-CDL). BPTrends Newsletter 3(3) (2005)
4. Lecture Notes in Computer Science;A.P. Barros,2005
5. Brogi, A., Canal, C., Pimentel, E., Vallecillo, A.: Formalizing Web Service Choreographies. In: Proceedings of First International Workshop on Web Services and Formal Methods. Elsevier, Amsterdam (2004)