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IEEE Communications Letters > 2009 > 13 > 9 > 670 - 672
IEEE Transactions on Communications > 2008 > 56 > 7 > 1047 - 1055
IEEE Communications Letters > 2009 > 13 > 9 > 670 - 672
IEEE Transactions on Communications > 2008 > 56 > 7 > 1047 - 1055