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Cocea, Mihaela and Weibelzahl, Stephan (2007) Cross-System Validation of Engagement Prediction from Log Files. In: Creating New Learning Experiences on a Global Scale. Lecture Notes in Computer Science (4753). Springer Berlin Heidelberg, Berlin, pp. 14-25. ISBN 9783540751953
Cocea, Mihaela and Weibelzahl, Stephan (2006) Motivation - Included or excluded from e-Learning. In: IADIS International Conference on Cognition and Exploratory Learning in Digital Age, 8-10 December 2006, Barcelona.