1. ABRAMSON, N, IRE TRANSACTIONS ON INFORMATION THEORY 8: 58 (1962).
2. Proceedings of the International Communications Conference 1966
3. Stanford Res. Inst. Rep. 1966 22
4. IBM RESEARCH REPORT 1955 RC-1500
5. DUDA, R.O., IEEE T ELECTRON COMP EC15: 220 (1966).