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IEEE Transactions on Services Computing > 2008 > 1 > 2 > 75 - 87
IEEE Latin America Transactions > 2008 > 6 > 4 > 339 - 346
IEEE Transactions on Services Computing > 2008 > 1 > 2 > 75 - 87
IEEE Latin America Transactions > 2008 > 6 > 4 > 339 - 346