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IEEE Communications Letters > 2011 > 15 > 2 > 199 - 201
IEEE Communications Letters > 2011 > 15 > 9 > 1010 - 1012
IEEE Communications Letters > 2011 > 15 > 2 > 199 - 201
IEEE Communications Letters > 2011 > 15 > 9 > 1010 - 1012