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\bibitem{Heh2007} Heh, J. - S., Li, S.-C., Chang, M., \& Huang, A.-H. (2007). Delivering Location-awareness Navigation Questions According to Learning Performance in Mobile Learning Environment. In \textit{In the Proceedings of the 8th International Conference on Information Technology Based Higher Education \& Training} (pp. 460--464). Kumamoto.

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