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IEEE Communications Letters > 2012 > 16 > 10 > 1592 - 1595
IEEE Communications Letters > 2010 > 14 > 10 > 945 - 947
IEEE Transactions on Vehicular Technology > 2009 > 58 > 7 > 3322 - 3332
IEEE Transactions on Vehicular Technology > 2008 > 57 > 5 > 3257 - 3263