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\bibitem{Khan2009} Khan, F. A., Graf, S., Weippl, E.R., \& Tjoa, A.M. (2009). Integrated Approach for the Detection of Learning Styles and Affective States. In \textit{Proceedings of the World Conference on Educational Multimedia, Hypermedia and Telecommunications (ED-Media 2009} (pp. 753--761.). Honolulu, Hawaii.

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