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IEEE Transactions on Education > 2015 > 58 > 4 > 242 - 248
IEEE Transactions on Education > 2014 > 57 > 3 > 169 - 174
IEEE Transactions on Education > 2015 > 58 > 4 > 242 - 248
IEEE Transactions on Education > 2014 > 57 > 3 > 169 - 174