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IEEE Communications Letters > 2009 > 13 > 2 > 139 - 141
IEEE Transactions on Information Theory > 2008 > 54 > 8 > 3741 - 3745
IEEE Transactions on Information Theory > 2008 > 54 > 8 > 3656 - 3662
IEEE Transactions on Information Theory > 2008 > 54 > 8 > 3778 - 3782