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IEEE Communications Letters > 2012 > 16 > 4 > 486 - 489
IEEE Transactions on Vehicular Technology > 2011 > 60 > 4 > 1880 - 1887
IEEE Communications Letters > 2012 > 16 > 4 > 486 - 489
IEEE Transactions on Vehicular Technology > 2011 > 60 > 4 > 1880 - 1887