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IEEE Transactions on Education > 2012 > 55 > 3 > 349 - 356
IEEE Transactions on Education > 1986 > E-29 > 3 > 142 - 149
IEEE Transactions on Education > 2012 > 55 > 3 > 349 - 356
IEEE Transactions on Education > 1986 > E-29 > 3 > 142 - 149