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IEEE Transactions on Learning Technologies > 2011 > 4 > 1 > 5 - 20
IEEE Internet Computing > 2011 > 15 > 2 > 79 - 81
IEEE Transactions on Learning Technologies > 2011 > 4 > 1 > 5 - 20
IEEE Internet Computing > 2011 > 15 > 2 > 79 - 81