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IEEE Transactions on Learning Technologies > 2011 > 4 > 2 > 149 - 161
IEEE Internet Computing > 2011 > 15 > 3 > 74 - 78
IEEE Transactions on Learning Technologies > 2011 > 4 > 2 > 149 - 161
IEEE Internet Computing > 2011 > 15 > 3 > 74 - 78