1. IEC 61508. Functional safety of electrical/electronic/programmable electronic safety-related systems. IEC, Genève, 1997.
2. ISA-S84.01.1996. Application of safety instrumented systems for the process industries. Instrument Society of America, Research Triangle Park, 1996.
3. DIN V 19250. Grundlegende Sicherheitsbetrachtungen für MSR-Schutzeinrichtungen. Berlin, 1994.
4. DIN/VDE 0801. Grundsätze für Rechner in Systemen mit Sicherheitsaufgaben. Berlin, 1990.
5. Uncertainty in safety, new techniques for the assessment and optimisation of safety in process industry;Rouvroye,1995