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IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 98 - 110
IEEE Transactions on Mobile Computing > 2013 > 12 > 7 > 1417 - 1427
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 98 - 110
IEEE Transactions on Mobile Computing > 2013 > 12 > 7 > 1417 - 1427