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IEEE Communications Letters > 2011 > 15 > 1 > 10 - 12
IEEE Transactions on Vehicular Technology > 2010 > 59 > 3 > 1497 - 1503
IEEE Communications Letters > 2011 > 15 > 1 > 10 - 12
IEEE Transactions on Vehicular Technology > 2010 > 59 > 3 > 1497 - 1503