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IEEE Communications Letters > 2012 > 16 > 5 > 752 - 755
IEEE Communications Letters > 2012 > 16 > 1 > 47 - 49
IEEE Transactions on Vehicular Technology > 2011 > 60 > 4 > 1880 - 1887
IEEE Transactions on Wireless Communications > 2011 > 10 > 5 > 1514 - 1526