1. C. Ames, S. Burleigh, S. Mitchell, WWWorkflow: world wide web based workflow, in: Hawaii International Conference on System Sciences, 1997.
2. D. Berardi, D. Calvanese, G. de Giacomo, M. Lenzerini, M. Mecella, Automatic composition of e-services that export their behavior, in: Proceedings of the 1st International Conference on Service Oriented Computing (ICSOC 2003), Lecture Notes in Computer Science, Springer, Berlin, 2003, pp. 43–58.
3. J. Blattman, N. Krishnan, D. Polla, M. Sum, Open-Source Portal Initiative at Sun, Part 2: Portlet Repository, 2006, Available from: , July 2007.
4. Process modeling in web applications;Brambilla;ACM Transactions on Software Engineering and Methodology (TOSEM),2006
5. J. Bézivin, In search of a basic principle for model driven engineering, UPGRADE, Novótica, 2, April 2004.