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IEEE Communications Letters > 2012 > 16 > 2 > 259 - 261
IEEE Transactions on Vehicular Technology > 2011 > 60 > 1 > 313 - 317
IEEE Transactions on Wireless Communications > 2010 > 9 > 8 > 2516 - 2527
IEEE Transactions on Communications > 2010 > 58 > 3 > 839 - 850