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IEEE Transactions on Professional Communication > 2009 > 52 > 2 > 138 - 151
IEEE Transactions on Learning Technologies > 2009 > 2 > 1 > 3 - 9
IEEE Transactions on Professional Communication > 2009 > 52 > 2 > 138 - 151
IEEE Transactions on Learning Technologies > 2009 > 2 > 1 > 3 - 9