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IEEE Communications Magazine > 2009 > 47 > 6 > 142 - 148
IEEE Wireless Communications > 2008 > 15 > 1 > 92 - 100
IEEE Wireless Communications > 2008 > 15 > 2 > 8 - 16
IEEE Communications Surveys & Tutorials > 2008 > 10 > 4 > 40 - 55