What rules for IP - enabled NGNs? : next generation networks - investment & regulation: London Business School GCC, 29 June 2006 / Robert Shaw
Digital networks, digital sections and digital line systems : recommendations G.801 - G.961 / International Telecommunication Union
Digital local, transit, combined and international exchanges in integrated digital networks and mixed analogue-digital networks : supplements: recommendations Q.500-Q.554 / International Telecommunication Union