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IEEE Transactions on Learning Technologies > 2008 > 1 > 3 > 176 - 189
IEEE Internet Computing > 2008 > 12 > 4 > 74 - 77
IEEE Transactions on Learning Technologies > 2008 > 1 > 3 > 176 - 189
IEEE Internet Computing > 2008 > 12 > 4 > 74 - 77