1. 29 CFR Part 1910.119, Process Safety Management of Highly Hazardous Chemicals, US Federal Register, 24 February 1992.
2. Application of Safety Instrumented Systems for the Process Industries, ISA standard 84, 1996.
3. Guidelines for Safety Automation of Chemical Processes, AIChE, CCPS, 1993.
4. Functional Safety—Safety Related Systems, IEC draft standard 1508, 1997.
5. The evaluation of safety instrumented systems—tools to peer past the hype;Gruhn;ISA transactions,1996