1. IEC, IEC 61508, Functional Safety of Electrical/Electronic/Programmable Electronic Safety-Related Systems, International Electrotechnical Commission, Geneva, 1998.
2. IEC, IEC 61511, Functional Safety of Instrumented Systems for the Process Industry Sector, International Electrotechnical Commission, Geneva, 2001.
3. ISA, ANSI/ISA-84.00.01-2004: Functional Safety: Safety Instrumented Systems for the Process Industry Sector, Instrument Society of America, Research Triangle Park, NC, 2004.