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[2] IEC 61508/IEC 61511 Safety Integrity Level, Functional safety in the process industry–risk reduction with safety instrumented systems, Endress + Hauser catalog.

[3] A. Ingrey, P. Lerévérend, A. Hildebrandt, Process Automation Manual; Safety Integrity Level; SIL 61508/61511, Pepperl+Fuchs.

[4] Lucas P. Safety Integrity Level. Sweden: ABB Engineering Services; Astra Zeneca; March 2007.

[5] Düpont D, Litz L, Netter P. Sources of Mistake in PFD Calculations for Safety–Related Loop Typical. July 2007 Research gate conference paper.  ...

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