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IEEE Transactions on Learning Technologies > 2015 > 8 > 4 > 357 - 366
IEEE Pervasive Computing > 2007 > 6 > 1 > 81 - 87
IEEE Transactions on Learning Technologies > 2015 > 8 > 4 > 357 - 366
IEEE Pervasive Computing > 2007 > 6 > 1 > 81 - 87