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IEEE Wireless Communications > 2010 > 17 > 5 > 12 - 21
IEEE Communications Surveys & Tutorials > 2009 > 11 > 3 > 71 - 91
IEEE Wireless Communications > 2010 > 17 > 5 > 12 - 21
IEEE Communications Surveys & Tutorials > 2009 > 11 > 3 > 71 - 91