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IEEE Transactions on Knowledge and Data Engineering > 2012 > 24 > 3 > 520 - 532
IEEE Transactions on Learning Technologies > 2008 > 1 > 3 > 145 - 156
IEEE Transactions on Knowledge and Data Engineering > 2012 > 24 > 3 > 520 - 532
IEEE Transactions on Learning Technologies > 2008 > 1 > 3 > 145 - 156