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IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and... > 2011 > 41 > 4 > 798 - 809
IEEE Intelligent Systems > 2010 > 25 > 1 > 58 - 67
IEEE Transactions on Learning Technologies > 2008 > 1 > 1 > 49 - 62
IEEE Transactions on Knowledge and Data Engineering > 2007 > 19 > 2 > 261 - 272