IEEE Communications Surveys & Tutorials
IEEE Communications Surveys & Tutorials > 2011 > 13 > 2 > 183 - 198
IEEE Communications Surveys & Tutorials > 2011 > 13 > 3 > 429 - 442
IEEE Communications Surveys & Tutorials > 2011 > 13 > 2 > 183 - 198
IEEE Communications Surveys & Tutorials > 2011 > 13 > 3 > 429 - 442