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IEEE Internet Computing > 2013 > 17 > 4 > 58 - 66
IEEE Transactions on Professional Communication > 2010 > 53 > 2 > 144 - 157
IEEE Internet Computing > 2013 > 17 > 4 > 58 - 66
IEEE Transactions on Professional Communication > 2010 > 53 > 2 > 144 - 157