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IEEE Communications Surveys & Tutorials > 2014 > 16 > 2 > 642 - 657
IEEE Transactions on Vehicular Technology > 2013 > 62 > 1 > 349 - 359
IEEE Communications Surveys & Tutorials > 2014 > 16 > 2 > 642 - 657
IEEE Transactions on Vehicular Technology > 2013 > 62 > 1 > 349 - 359