IEEE Communications Magazine
IEEE Communications Magazine > 2007 > 45 > 11 > 64 - 70
IEEE Communications Magazine > 2009 > 47 > 4 > 14 - 16
IEEE Communications Magazine > 2009 > 47 > 7 > 102 - 109
IEEE Communications Magazine > 2011 > 49 > 7 > 156 - 163