1. Coutinho, J.S., Failure Effect Analysis, Trans.NYAcad. Sci., Vol.26, Series II, 1963-64, pp.564-584.
2. Haasl, D.F., Advanced Concepts in Fault Tree Analysis, System Safety Symposium, 1965. Available from the University of Washington Library, Seattle.
3. Fleming, K.N., A Redundant Model for Common Mode Failures in Redundant and Safety Systems, Proceedings of the Sixth Pittsburgh Annual Modeling and Simulation Conference, 1975, pp.579-581.