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IEEE Transactions on Education > 2015 > 58 > 4 > 262 - 268
IEEE Transactions on Learning Technologies > 2015 > 8 > 4 > 393 - 401
IEEE Transactions on Education > 2015 > 58 > 4 > 262 - 268
IEEE Transactions on Learning Technologies > 2015 > 8 > 4 > 393 - 401