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Proceedings of the IEEE > 2008 > 96 > 4 > 589 - 601
IEEE Transactions on Learning Technologies > 2008 > 1 > 3 > 145 - 156
Proceedings of the IEEE > 2008 > 96 > 4 > 589 - 601
IEEE Transactions on Learning Technologies > 2008 > 1 > 3 > 145 - 156