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IEEE Communications Surveys & Tutorials > 2009 > 11 > 2 > 33 - 51
IEEE Communications Letters > 2008 > 12 > 2 > 127 - 129
IEEE Communications Letters > 2007 > 11 > 7 > 574 - 576
IEEE Communications Surveys & Tutorials > 2009 > 11 > 2 > 33 - 51
IEEE Communications Letters > 2008 > 12 > 2 > 127 - 129
IEEE Communications Letters > 2007 > 11 > 7 > 574 - 576