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IEEE Transactions on Education > 2011 > 54 > 1 > 125 - 132
2010 IEEE Frontiers in Education Conference (FIE) > F4J-1 - F4J-5
2010 International Symposium on Information Technology > 2 > 630 - 635
2010 2nd International Conference on Education Technology and Computer > 2 > V2-525 - V2-528