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In: Lecture Notes in Computer Science,. International Conference on Intelligent Tutoring Systems (ITS-10) Pages 377-379 Springer Berlin 2010.

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In: International Journal of Computer-Supported Collaborative Learning (ijCSCL) 5 1 Pages 43-102 Springer 2010.

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German Research Center for Artificial Intelligence
Deutsches Forschungszentrum für Künstliche Intelligenz