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IT Professional > 2013 > 15 > 2 > 57 - 59
IEEE Internet Computing > 2010 > 14 > 2 > 78 - 82
IEEE Transactions on Learning Technologies > 2008 > 1 > 4 > 199 - 214
IT Professional > 2013 > 15 > 2 > 57 - 59
IEEE Internet Computing > 2010 > 14 > 2 > 78 - 82
IEEE Transactions on Learning Technologies > 2008 > 1 > 4 > 199 - 214