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2. Measuring fracture toughness – a simplified approach using controlled crack propagation;Weitzman;J Mater,1972
3. ASTM E 399-90. Standard test method for plane-strain fracture toughness of metallic materials. ASTM International; re-approved 1997.
4. NASGRO 3.0. Fatigue crack growth computer program “NASGRO” Version 3.0. National Aeronautics and Space Administration, Lyndon B. Johnson Space Centre, Houston, Texas; 2000.
5. USAF handbook for damage tolerant design, last update 2002 [chapter 4.5: Residual strength. Built-up structures].