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IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 898 - 908
IEEE Journal on Selected Areas in Communications > 2011 > 29 > 5 > 938 - 950
IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 898 - 908
IEEE Journal on Selected Areas in Communications > 2011 > 29 > 5 > 938 - 950