The Iron Triangle: Inside the Secret World of The Carlyle Group ( http://dogbert.abebooks.com/servlet/SearchResults?sts=t&y=0&tn=The+Secret+ World+of+the+Carlyle+Group&x=0 ). [26] See http://en.wikipedia.org/wiki/Back-channel —A back channel in the language of diplomacy is an unofficial channel of communication between states or other political entities, used to supplement official channels, often for the purposes of discussing highly sensitive