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IEEE Communications Magazine > 2009 > 47 > 6 > 150 - 155
IEEE Communications Surveys & Tutorials > 2009 > 11 > 4 > 3 - 18
IEEE Transactions on Communications > 2009 > 57 > 3 > 779 - 788
IEEE Vehicular Technology Magazine > 2008 > 3 > 3 > 37 - 46