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IEEE Communications Surveys & Tutorials > 2010 > 12 > 4 > 488 - 503
IEEE Communications Letters > 2009 > 13 > 7 > 546 - 548
IEEE Communications Surveys & Tutorials > 2010 > 12 > 4 > 488 - 503
IEEE Communications Letters > 2009 > 13 > 7 > 546 - 548