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\bibitem{Sakurai2009} Sakurai, Y., Kinshuk, Graf, S., Zarypolla, A., Takada, K. and Tsuruta, S. (2009). Enriching web based computer supported collaborative learning systems by considering misunderstandings among learners during interactions. In \textit{Proceedings of the IEEE International Conference on Advanced Learning Technologies (ICALT 2009)} (pp. 306--310). Riga, Latvia: IEEE Computer Society.

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