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IEEE Transactions on Learning Technologies > 2010 > 3 > 1 > 33 - 44
IEEE Transactions on Education > 2006 > 49 > 2 > 183 - 192
IEEE Transactions on Learning Technologies > 2010 > 3 > 1 > 33 - 44
IEEE Transactions on Education > 2006 > 49 > 2 > 183 - 192