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\bibitem{Khan2010} Khan, F. A., Graf, S., Weippl, E.R. \& Tjoa, A.M. (2010). Implementation of Affective States and Learning Styles Tactics in Web-based Learning Management Systems. International Workshop on Design Centered and Personalized Learning in Liquid and Ubiquitous Learning Places -- Future Visions and Practical Implementations (DULP 2010). In \textit{Proceedings of the IEEE International Conference on Advanced Learning Technologies} (pp. 734--735). Sousse, Tunisia: IEEE Computer Society.

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