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\bibitem{Khan2010} Khan, F. A., Graf, S., Weippl, E.R., \& Tjoa, A.M. (2010). Identifying and Incorporating Affective States and Learning Styles in Web-based Learning Management Systems. \textit{International Journal of Interaction Design \& Architectures (IxD\&A)}, \textit{9-10}, 85--103.

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