1. MNT Gas Sensor Forum. MNT Gas Sensor Roadmap. 2006.
www.technologyprogramme.org.uk/site/TechnologyReports
. Accessed 2006.
2. Institution of Gas Engineers and Managers. Dealing with reported gas escapes, Publication SR/20. 1998.
www.igem.org.uk/Technical/publications.asp
. Accessed 1998
3. European Standard, EN 50014: Electrical apparatus for potentially explosive atmospheres, General requirements. 1998.
4. European Standard, EN 50018: Electrical apparatus for potentially explosive atmospheres, Flameproof enclosure “d”. 2000.
5. European Standard, EN 50019: Electrical apparatus for potentially explosive atmospheres, Increased safety “e”. 2000.