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IEEE Communications Surveys & Tutorials > 2012 > 14 > 3 > 662 - 680
IEEE Communications Magazine > 2008 > 46 > 10 > 162 - 168
Wireless Personal Communications > 2002 > 22 > 2 > 261-273
IEEE Communications Surveys & Tutorials > 2012 > 14 > 3 > 662 - 680
IEEE Communications Magazine > 2008 > 46 > 10 > 162 - 168
Wireless Personal Communications > 2002 > 22 > 2 > 261-273