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IEEE Communications Letters > 2010 > 14 > 10 > 945 - 947
IEEE Communications Letters > 2010 > 14 > 2 > 145 - 147
IEEE Transactions on Vehicular Technology > 2009 > 58 > 9 > 4837 - 4847
IEEE Transactions on Communications > 2009 > 57 > 10 > 2918 - 2922