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IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 565 - 578
IEEE Communications Letters > 2010 > 14 > 7 > 679 - 681
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 565 - 578
IEEE Communications Letters > 2010 > 14 > 7 > 679 - 681