1. Local-exchange renewal strategy: formulating a strategy;Benson;Post Off. Elec. Eng. J.,1974
2. Transition to a digital telephone network;Braugenhardt,1976
3. The introduction of digital switching to the local network;Combot;IEEE Trans. Commun.,1979
4. Optimal digital switching introduction into the local network;Combot;IEEE Trans. Commun.,1981
5. Application of electronic switching systems in the replacement of electromechancial switching systems;Johnston,1976