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IEEE Communications Letters > 2009 > 13 > 2 > 154 - 156
IEEE Transactions on Vehicular Technology > 2007 > 56 > 6-1 > 3408 - 3420
IEEE Communications Letters > 2009 > 13 > 2 > 154 - 156
IEEE Transactions on Vehicular Technology > 2007 > 56 > 6-1 > 3408 - 3420