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IEEE Transactions on Services Computing > 2009 > 2 > 4 > 338 - 351
IEEE Security & Privacy > 2009 > 7 > 4 > 74 - 76
IEEE Intelligent Systems > 2009 > 24 > 6 > 32 - 36
IEEE Security & Privacy > 2009 > 7 > 3 > 57 - 59
IEEE Internet Computing > 2009 > 13 > 2 > 92 - 98