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IEEE Communications Letters > 2011 > 15 > 5 > 515 - 517
IEEE Transactions on Vehicular Technology > 2011 > 60 > 1 > 298 - 312
IEEE Communications Letters > 2011 > 15 > 5 > 515 - 517
IEEE Transactions on Vehicular Technology > 2011 > 60 > 1 > 298 - 312