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IEEE Systems Journal > 2015 > 9 > 3 > 892 - 903
IEEE Transactions on Services Computing > 2015 > 8 > 1 > 121 - 135
IEEE Systems Journal > 2015 > 9 > 3 > 892 - 903
IEEE Transactions on Services Computing > 2015 > 8 > 1 > 121 - 135