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IEEE Communications Surveys & Tutorials > 2010 > 12 > 2 > 205 - 221
IEEE Transactions on Mobile Computing > 2007 > 6 > 1 > 26 - 38
IEEE Communications Surveys & Tutorials > 2010 > 12 > 2 > 205 - 221
IEEE Transactions on Mobile Computing > 2007 > 6 > 1 > 26 - 38