1. NDT used in the Netherlands From a principal point of view.;Postema,2003
2. National Bridge Inventory Website (NBI) (2009). “United States NBI report 2009,” http://www.fhwa.dot.gov/bridge/inspection/, (July 2014).
3. American Association of State Highway and Transportation officials (AASHTO), “Standard Specifications for Transportation Materials and Methods of Sampling and Testing,” 33rd Edition, 2013.
4. Progress in Structural Engineering and Materials
5. Inspection was ‘deficient’ - Teams failed to detect corrosion on Dig light http://bostonherald.com/news_opinion/local_politics/2011/03/inspection_was_%E2%80%98deficient%E2%80%99