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IEEE Latin America Transactions > 2010 > 8 > 6 > 695 - 702
IEEE Transactions on Education > 2009 > 52 > 1 > 169 - 176
IEEE Latin America Transactions > 2010 > 8 > 6 > 695 - 702
IEEE Transactions on Education > 2009 > 52 > 1 > 169 - 176