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\bibitem{Graf2008} Graf, S., MacCallum, K, Liu, T-C, Chang, M., Wen, D., Tan, Q., Dron, J., Lin, F., McGreal, R., \& Kinshuk. (2008). An Infrastructure for Developing Pervasive Learning Environments. In \textit{In the Proceedings of the 6th Annual IEEE International Conference on Pervasive Computing and Communications} (pp. 389--394). Hong Kong.

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