IEEE Communications Magazine
IEEE Communications Magazine > 2005 > 43 > 1 > 108 - 114
IEEE Communications Magazine > 2006 > 44 > 12 > 104 - 114
IEEE Communications Magazine > 2008 > 46 > 5 > 60 - 66
IEEE Communications Magazine > 2009 > 47 > 8 > 26 - 34