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IEEE Communications Letters > 2012 > 16 > 8 > 1270 - 1273
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 579 - 606
IEEE Communications Letters > 2012 > 16 > 8 > 1270 - 1273
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 579 - 606