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IEEE Transactions on Learning Technologies > 2017 > 10 > 4 > 532 - 543
IEEE Computer Graphics and Applications > 2017 > 37 > 1 > 70 - 78
IEEE Transactions on Learning Technologies > 2017 > 10 > 4 > 532 - 543
IEEE Computer Graphics and Applications > 2017 > 37 > 1 > 70 - 78