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IEEE Transactions on Education > 2015 > 58 > 2 > 90 - 97
IEEE Transactions on Visualization and Computer Graphics > 2015 > 21 > 4 > 529 - 538
IEEE Transactions on Learning Technologies > 2015 > 8 > 2 > 187 - 200
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 136 - 148