United States. Government Accountability Office. Critical Infrastructure Protection: Sector-Specific Plans' Coverage of Key Cyber Security Elements Varies, report, October 31, 2007; (https://digital.library.unt.edu/ark:/67531/metadc296972/m1/1/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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