IEEE Communications Surveys & Tutorials
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 338 - 354
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 240 - 264
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 338 - 354
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 240 - 264