IEEE Communications Surveys & Tutorials
IEEE Communications Surveys & Tutorials > 2011 > 13 > 3 > 503 - 520
IEEE Communications Surveys & Tutorials > 2011 > 13 > 3 > 396 - 428
IEEE Communications Surveys & Tutorials > 2011 > 13 > 3 > 503 - 520
IEEE Communications Surveys & Tutorials > 2011 > 13 > 3 > 396 - 428