1. what went wrong? Case histories of process plant disasters;Kletz,1999
2. Layers of protection analysis for human factors (LOPA-HF);Baybutt;Process Safety Progress,2002
3. “Practical Industrial Safety, Risk Assessment, and Shutdown Systems”, Elsevier Science &;Macdonald,2004
4. Bayesian networks make LOPA more effective, QRA more transparent and flexible, and thus safety more definable!;Pasman;Journal of Loss Prevention in the Process Industries,2012
5. Saeed Karimi “Fuzzy Risk Assessment and Categorization, based on Event Tree Analysis (ETA) and Layer of Protection Analysis (LOPA): Case Study in Gas Transport System”;Khaleghi;World Applied Programming,2013