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\bibitem{Chang2009} Chang, M., Tan, Q., Liu, T.-C., \& Lin, F. (2009). Multi-Agent Architecture and Location-Based Ubiquitous Learning Framework. In Qing Li and Timothy K. Shih (Ed.), \textit{Ubi-Media Computing} (. pp. 341--354). Boca Raton, Florida: Taylor \& Francis Group.

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