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IEEE Transactions on Education > 2009 > 52 > 3 > 394 - 399
IEEE Transactions on Learning Technologies > 2009 > 2 > 4 > 263 - 274
IEEE Transactions on Education > 2009 > 52 > 3 > 394 - 399
IEEE Transactions on Learning Technologies > 2009 > 2 > 4 > 263 - 274