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IEEE Journal on Selected Areas in Communications > 2009 > 27 > 2 > 172 - 181
IEEE Communications Surveys & Tutorials > 2003 > 5 > 1 > 14 - 26
IEEE Journal on Selected Areas in Communications > 2009 > 27 > 2 > 172 - 181
IEEE Communications Surveys & Tutorials > 2003 > 5 > 1 > 14 - 26