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IEEE MultiMedia > 2016 > 23 > 1 > 48 - 59
IEEE Transactions on Learning Technologies > 2013 > 6 > 1 > 85 - 96
Proceedings of the IEEE > 2013 > 101 > 6 > 1268 - 1270
IEEE Transactions on Learning Technologies > 2013 > 6 > 1 > 73 - 84