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IEEE Computer Graphics and Applications > 2011 > 31 > 3 > 84 - 88
IEEE Transactions on Education > 2011 > 54 > 2 > 273 - 278
IEEE Computer Graphics and Applications > 2011 > 31 > 3 > 84 - 88
IEEE Transactions on Education > 2011 > 54 > 2 > 273 - 278