IEEE Communications Magazine
IEEE Communications Magazine > 2005 > 43 > 1 > 108 - 114
IEEE Communications Magazine > 2005 > 43 > 2 > S10 - S15
IEEE Communications Magazine > 2006 > 44 > 8 > 43 - 51
IEEE Communications Magazine > 2007 > 45 > 10 > 62 - 69