1. Tiffany , C. F. Gallagher , J. P. Babish IV C. A. 2010 Threats to aircraft structural safety, including a compendium of selected structural accidents/incidents
2. FAA-2010-1280-001 2011 Federal Register, Vol 76, Rules and Regulations
3. FAA AC No: 120-104 2011 Establishing and implementing limit of validity to prevent widespread fatigue damage
4. Davis , S. L. De Good , K. Donohue , N. Goldberg D. 2013 The fix we're in for: the state of our nation's busiest bridges, transportation for America http://t4america.org/docs/bridgereport2013/2013BridgeReport.pdf
5. http://www.railwayage.com/index.php/mechanical/freight-cars/ttci-rd-how-healthy-are-your-castings.html