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\bibitem{Khan2009} Khan, F. A., Graf, S., Weippl, E.R., \& Tjoa, A.M. (2009). An Approach for Identifying Affective States through Behavioral Patterns in Web-based Learning Management System. In \textit{Proceedings of the International Conference on Information Integration and Web-based Applications \& Services (iiWAS2009)} (pp. 429--433). Kuala Lumpur, Malaysia: ACM.

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