IEEE Communications Surveys & Tutorials
IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 768 - 786
IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 551 - 591
IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 768 - 786
IEEE Communications Surveys & Tutorials > 2013 > 15 > 2 > 551 - 591