1. F.H.A. (FWHA), Deficient bridges by state and highway system, https://www.fhwa.dot.gov/bridge/defbr07.cfm, 2007.
2. B.M. Phares, Health monitoring of bridge structures and components using smart structure technology, volume 2, Wisconsin Highway Research Program, 2005.
3. Ground penetrating radar;Daniels;Encyclopedia of RF and Microwave Engineering,2005
4. Acoustic emission monitoring of bridges: review and case studies;Nair;Engineering structures,2010
5. J.K. Sinha, Health monitoring techniques for rotating machinery, Ph.D. thesis, University of Wales, Swansea, 2002.