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In: Beverley P. Woolf, Esma Aimeur, Roger Nkambou, Susanne Lajoie (editor). Proceedings of the 9th International Conference on Intelligent Tutoring Systems. International Conference on Intelligent Tutoring Systems (ITS-08) 9th June 23-27 Montréal Canada Pages 715-718 Lecture Notes in Computer Science (LNCS) 5091 Springer Verlag 2008.
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