IEEE Communications Letters
IEEE Communications Letters > 2009 > 13 > 3 > 199 - 201
IEEE Communications Letters > 2009 > 13 > 5 > 294 - 296
IEEE Communications Letters > 2009 > 13 > 3 > 199 - 201
IEEE Communications Letters > 2009 > 13 > 5 > 294 - 296