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Proceedings of the IEEE > 2010 > 98 > 6 > 903 - 905
IEEE Communications Surveys & Tutorials > 2004 > 6 > 4 > 44 - 66
Proceedings of the IEEE > 2010 > 98 > 6 > 903 - 905
IEEE Communications Surveys & Tutorials > 2004 > 6 > 4 > 44 - 66