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IEEE Communications Surveys & Tutorials > 2009 > 11 > 4 > 78 - 108
IEEE Transactions on Mobile Computing > 2007 > 6 > 7 > 815 - 831
IEEE Communications Surveys & Tutorials > 2009 > 11 > 4 > 78 - 108
IEEE Transactions on Mobile Computing > 2007 > 6 > 7 > 815 - 831