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IEEE Communications Letters > 2011 > 15 > 4 > 401 - 403
IEEE Transactions on Vehicular Technology > 2008 > 57 > 2 > 893 - 905
IEEE Communications Letters > 2011 > 15 > 4 > 401 - 403
IEEE Transactions on Vehicular Technology > 2008 > 57 > 2 > 893 - 905