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Wheeler, David A (2013-08-21). "What is open security?" (PDF). Institute for Defense Analyses. Defence Technical Information Center. Archived from the original on May 6, 2021. Retrieved 2018-01-08. https://apps.dtic.mil/sti/pdfs/ADA607073.pdf
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Wheeler, David A (2013-08-21). "What is open security?" (PDF). Institute for Defense Analyses. Defence Technical Information Center. Archived from the original on May 6, 2021. Retrieved 2018-01-08. https://apps.dtic.mil/sti/pdfs/ADA607073.pdf
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