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IEEE Transactions on Human-Machine Systems > 2017 > 47 > 6 > 903 - 908
IEEE Transactions on Learning Technologies > 2017 > 10 > 4 > 488 - 501
IEEE Access > 2017 > 5 > 10968 - 10978
IEEE Transactions on Network Science and Engineering > 2017 > 4 > 1 > 1 - 12
IEEE Transactions on Learning Technologies > 2016 > 9 > 4 > 354 - 365