1. Office of Science and Technology Policy, Executive Office of the President, and the Science and Technology Directorate, Department of Homeland Security, The National Plan for Research and Development in Support of Critical Infrastructure Protection, Washington, DC, 2004.
2. Federal Highway Administration, Recommendations for Bridge and Tunnel Security, Blue Ribbon Panel Report, Report No. FHWA-IF-03-036, Washington, DC, September 2003.
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