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IEEE Transactions on Wireless Communications > 2009 > 8 > 11 > 5520 - 5529
IEEE Communications Magazine > 2009 > 47 > 6 > 132 - 141
IEEE Transactions on Wireless Communications > 2008 > 7 > 10 > 3951 - 3961
IEEE Communications Letters > 2007 > 11 > 9 > 708 - 710