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IEEE Transactions on Knowledge and Data Engineering > 2009 > 21 > 6 > 894 - 909
IEEE Transactions on Education > 2009 > 52 > 1 > 109 - 115
IEEE Transactions on Knowledge and Data Engineering > 2009 > 21 > 6 > 894 - 909
IEEE Transactions on Education > 2009 > 52 > 1 > 109 - 115