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2010 2nd International Conference on Education Technology and Computer > 2 > V2-60 - V2-62
2010 2nd International Conference on Computer Engineering and Technology > 3 > V3-441 - V3-445
IEEE Transactions on Education > 2010 > 53 > 3 > 358 - 364
IEEE Transactions on Knowledge and Data Engineering > 2009 > 21 > 6 > 854 - 866