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3. AQSIQ and SAC, General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and Standardization Administration of the People's Republic of China, 2011. Graphical symbols – Safety colors and safety signs, Part 1: Design principles for safety signs and safety markings (ISO 3864-1).
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5. Fuzzy-based HAZOP study for process industry;Ahn;J. Hazard. Mater.,2016