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IEEE Computer Graphics and Applications > 2011 > 31 > 3 > 84 - 88
2010 2nd International Conference on Education Technology and Computer > 2 > V2-355 - V2-359
IEEE Transactions on Education > 2010 > 53 > 1 > 71 - 79
2008 International Conference on Cyberworlds > 710 - 713