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IEEE Transactions on Learning Technologies > 2017 > 10 > 1 > 68 - 81
IEEE Transactions on Learning Technologies > 2017 > 10 > 1 > 93 - 103
IEEE Transactions on Learning Technologies > 2017 > 10 > 1 > 30 - 41
IEEE Transactions on Learning Technologies > 2017 > 10 > 1 > 82 - 92
China Communications > 2016 > 13 > 12 > 277 - 296