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IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 464 - 490
IEEE Latin America Transactions > 2011 > 9 > 2 > 213 - 218
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 464 - 490
IEEE Latin America Transactions > 2011 > 9 > 2 > 213 - 218