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IEEE Transactions on Learning Technologies > 2011 > 4 > 2 > 125 - 137
IEEE Transactions on Education > 2011 > 54 > 1 > 87 - 96
IEEE Transactions on Education > 2011 > 54 > 2 > 222 - 228
IEEE Transactions on Education > 2011 > 54 > 2 > 210 - 215
2010 IEEE International Symposium on Multimedia > 377 - 382