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IEEE Transactions on Education > 2011 > 54 > 2 > 302 - 307
IEEE Transactions on Education > 2009 > 52 > 2 > 279 - 285
IEEE Transactions on Education > 2011 > 54 > 2 > 302 - 307
IEEE Transactions on Education > 2009 > 52 > 2 > 279 - 285