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V. Gómez, A. Kaltenbrunner, and V. López. WWW '08: Proceeding of the 17th international conference on World Wide Web, page 645--654. New York, NY, USA, ACM, (2008)
J. van Wamelen, and D. de Kool. Proceedings of the 2nd International Conference on Theory and Practice of Electronic Governance, page 349--354. Cairo, Egypt, ACM, (2008)