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IEEE Communications Letters > 2009 > 13 > 4 > 242 - 244
IEEE Transactions on Vehicular Technology > 2008 > 57 > 5 > 2815 - 2821
IEEE Communications Letters > 2009 > 13 > 4 > 242 - 244
IEEE Transactions on Vehicular Technology > 2008 > 57 > 5 > 2815 - 2821