1. IEC 61508-4, Functional Safety of Electrical/Electronic/ Programmable electronic safety-related systems 2010
2. An introduction to Safety Critical Systems. IPL intelligent business 2011 http://www.ipl.com/pdf/p0826.pdf
3. Safety critical systems: challenges and directions;Knight;Proceedings of the 24th International Conference on Software Engineering,2002
4. 150 years of train-disasters - Practical approaches for emergency responders;Kuepper;9-1-1 Magazine