1. IMO. Guidelines for vessels with dynamic positioning systems. MSC Circ 1994; 645.
2. Norwegian Petroleum Directorate. Trends in risk levels—Norwegian Continental Shelf, Main report, Phase 3–2002, 2003-05-05 [in Norwegian].
3. Norwegian Petroleum Directorate. Regulations relating to Management in the Petroleum Activities (the Management Regulations), 2001.
4. Norwegian Petroleum Directorate. Guidelines to Regulations relating to Management in the Petroleum Activities (the Management Regulations) 2002.
5. Work Together for Safety Forum. Report Phase 1—Proposal to barrier concept and definitions. Workgroup Barriers, 2004 [in Norwegian].