IEEE Communications Surveys & Tutorials
IEEE Communications Surveys & Tutorials > 2012 > 14 > 1 > 109 - 130
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 322 - 337
IEEE Communications Surveys & Tutorials > 2012 > 14 > 1 > 109 - 130
IEEE Communications Surveys & Tutorials > 2012 > 14 > 2 > 322 - 337