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2. Innovative operating instructions;Brun,2004
3. European Committee for Standardization (CEN), 1991a. EN 292-1 Safety of machinery, Basic concepts, General principles for design: Part 1: basic terminology; methodology, Brussels.
4. European Committee for Standardization (CEN), 1991b. EN 292-2 Safety of machinery, Basic concepts, General principles for design: Part 2: technical principles and specifications, Brussels.
5. European Committee for Standardization (CEN), 2001. EN 62079 Preparation of instructions – structuring, content and presentation, Brussels.