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IEEE Communications Letters > 2008 > 12 > 4 > 241 - 243
IEEE Transactions on Vehicular Technology > 2007 > 56 > 6-1 > 3421 - 3430
IEEE Communications Letters > 2008 > 12 > 4 > 241 - 243
IEEE Transactions on Vehicular Technology > 2007 > 56 > 6-1 > 3421 - 3430