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2. https://www.faa.gov/about/history/timeline
3. https://www.gao.gov Investigation Into the F-111 Program
4. Paul C. Paris, M. P. Gomez and W. E. Anderson. A Rational Analytic Theory of Fatigue. The Trend in Engineering 13, 9 -14 (1961)
5. API RP 579 Fitness-For-Service, 2000 Edition. API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005 (2000)