IEEE Communications Letters
IEEE Communications Letters > 2008 > 12 > 2 > 109 - 111
IEEE Communications Letters > 2008 > 12 > 3 > 182 - 184
IEEE Communications Letters > 2008 > 12 > 4 > 259 - 261
IEEE Communications Letters > 2008 > 12 > 10 > 724 - 726