Boualem Benatallah Fabio Casati Farouk Toumani Web Service Conversation Modeling: A Cornerstone for E-Business Automation. 46-54 2004 8 IEEE Internet Computing 1 http://csdl.computer.org/comp/mags/ic/2004/01/w1046abs.htm db/journals/internet/internet8.html#BenatallahCT04