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IEEE Internet Computing > 2012 > 16 > 3 > 70 - 76
IEEE Software > 2011 > 28 > 1 > 70 - 72
IEEE Transactions on Learning Technologies > 2011 > 4 > 1 > 21 - 34
IEEE Internet Computing > 2012 > 16 > 3 > 70 - 76
IEEE Software > 2011 > 28 > 1 > 70 - 72
IEEE Transactions on Learning Technologies > 2011 > 4 > 1 > 21 - 34