1. Fault Tree Handbook, NUREG-0492;Vesely,1981
2. Guide to the Firesafety Concepts Tree, NFPA 550,1986
3. A probability model for fire safety tree elements;Watts;Hazard Prev., J. Systems Safety Soc.,1983
4. Reliability in Engineering Design;Kapur,1977
5. Theoretical Rationalization of a Goal-Oriented Systems Approach to Building Fire Safety, NBS-GCR-79–163;Watts,1979