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IEEE Transactions on Education > 2010 > 53 > 2 > 248 - 256
IEEE Transactions on Education > 2009 > 52 > 4 > 573 - 575
IEEE Transactions on Education > 2010 > 53 > 2 > 248 - 256
IEEE Transactions on Education > 2009 > 52 > 4 > 573 - 575