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IEEE Transactions on Learning Technologies > 2011 > 4 > 2 > 138 - 148
IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and... > 2011 > 41 > 4 > 784 - 797
IEEE Transactions on Information Technology in Biomedicine > 2011 > 15 > 1 > 164 - 170