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IEEE Communications Letters > 2009 > 13 > 9 > 706 - 708
IEEE Transactions on Communications > 2009 > 57 > 10 > 2903 - 2908
IEEE Communications Letters > 2009 > 13 > 4 > 221 - 223
IEEE Transactions on Information Theory > 2009 > 55 > 4 > 1665 - 1682