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\bibitem{Imran_etal2015} Imran, H., Ballance, K., Da Silva, J. M. C., Kinshuk, \& Graf, S. (2015). \textit{VAT-RUBARS: A Visualization and Analytical Tool for a Rule-Based Recommender System to Support Teachers in a Learner-Centered Learning Approach}. State-of-the-Art and Future Directions of Smart Learning. Springer Singapore.

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