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\bibitem{Hsu2005} Hsu, C. - K., Chang, J.-C., Chang, M., \& Heh, J.-S. (2005). Unsupervised Knowledge Navigation: Reconstructing the Hypermedia Structure of Instructional Materials on World Wide Web. \textit{WSEAS Transactions on Information Science and Applications}, \textit{2}(10), 1505--1513.

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