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IEEE Transactions on Learning Technologies > 2015 > 8 > 3 > 311 - 321
IEEE Transactions on Education > 2014 > 57 > 4 > 220 - 228
IEEE Transactions on Learning Technologies > 2015 > 8 > 3 > 311 - 321
IEEE Transactions on Education > 2014 > 57 > 4 > 220 - 228