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IEEE Transactions on Education > 2015 > 58 > 3 > 194 - 202
IEEE Transactions on Learning Technologies > 2015 > 8 > 2 > 187 - 200
IEEE Transactions on Image Processing > 2015 > 24 > 4 > 1244 - 1246
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 43 - 54