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IEEE Communications Letters > 2009 > 13 > 8 > 615 - 617
IEEE Transactions on Vehicular Technology > 2007 > 56 > 5-2 > 3220 - 3227
IEEE Communications Letters > 2009 > 13 > 8 > 615 - 617
IEEE Transactions on Vehicular Technology > 2007 > 56 > 5-2 > 3220 - 3227