1. ISO/IEC Guide 51: 1999, Safety aspects – guidelines for their inclusion in standards.
2. ISO/IEC Guide 73: 2002, Risk management – guidelines for use in standards.
3. Injury facts,2007
4. Responsible risks, safe space, Advisory Note from VROM Council and Council for Transport,2003
5. Determination of safety distances, European Industrial Gas Association, IGC Doc 75/07/E/.