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IEEE Communications Letters > 2010 > 14 > 1 > 18 - 20
IEEE Transactions on Vehicular Technology > 2009 > 58 > 7 > 3518 - 3532
IEEE Communications Letters > 2010 > 14 > 1 > 18 - 20
IEEE Transactions on Vehicular Technology > 2009 > 58 > 7 > 3518 - 3532