1. Adelman, S., and Shinners, S. (1960). Group-redundant techniques for feedback control systems, NERUM Record pp. 62–63.
2. Theoretical considerations on reliability properties of recursive triangular switching networks;Amarel,1962
3. Amarel, S., Brzozowski, J. A., and Levy, S. Y. (1962). Theory of adjustable switching networks, I. B. Reliability of switching networks (AD-282248). Air Force Cambridge Res. Labs. Bedford, Massachusetts.
4. Anderson, R. O. (1958). Methods of analysis for space vehicle control system redundancy (AD-206670), WADC Flight Control Lab., Wright-Patterson AFB, Ohio. WADC Tech. Note No. 58–346.
5. The need and means for self-repairing circuits;Angell;IEEE Intern. Convention Record,1963